キャッシングチュートリアルパート2

キャッシュとその使用に関する資料のかなり詳細で興味深いプレゼンテーションの2番目の部分。 パート1

著者のMark Nottinghamは、HTTPプロトコルとWebキャッシングの分野で認められた専門家です。 彼はIETF HTTPbisワーキンググループの議長です。 彼はHTTP / 1.1の編集に参加しました。 6：キャッシング。 現在、HTTP / 2.0の開発に関与しています。

このテキストは、 Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported Licenseの下でライセンスされています。

翻訳者から：タイプミスと不正確さについては、PMでお知らせください。 ありがとう

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キャッシュを管理する方法（およびしない方法）

キャッシュがサイトでどのように機能するかを微調整するために、WebデザイナーとWebマスターが使用できるツールがいくつかあります。 これには、サーバー構成に少し慣れる必要があるかもしれませんが、それだけの価値はあります。 これらのツールを使用してサーバーを操作する方法の詳細については、以下の「 実装 」セクション（翻訳者のメモ-次の部分）を参照してください。

HTMLメタタグとHTTPヘッダー

HTMLスペシャリストは、 HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).するHTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).セクションに特定のタグを配置できHTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ). HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

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-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

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POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
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- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).
• HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).

HTML-, . - , .

- , . , , ( HTML-). - - Pragma: no-cache HTML- , .

, HTTP- , , . HTML , , -. , , . , HTTP- , .

HTTP- HTML . HTTP/1.1 :

HTTP/1.1 200 OK
Date: Fri, 30 Oct 1998 13:19:41 GMT
Server: Apache/1.3.3 (Unix)
Cache-Control: max-age=3600, must-revalidate
Expires: Fri, 30 Oct 1998 14:19:41 GMT
Last-Modified: Mon, 29 Jun 1998 02:28:12 GMT
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

HTML , . “ ” (. - ), , HTTP-.

- (ISP) - HTTP- ( Expires Cache-Control ), ; , .

HTTP- Pragma ( )
, HTTP- Pragma: no-cache . ; HTTP Pragma ; Pragma (, ) . , - , . , .

HTTP- Expires
HTTP- Expires - ; , . , , , . Expires .

- Expires . , ; , , (last access time); , (last modification time).

Expires ( ). , . , . , - , , “”.

, HTTP- HTTP- Expires . - , . , , HTTP- (GMT), .

:
Expires: Fri, 30 Oct 1998 14:19:41 GMT

Expires , . -, - , ; /, .

Expires , , . Expires , , , .

, - , Expires . - ( Network Time Protocol , NTP); .

HTTP- Cache-Control
HTTP/1.1 , Cache-Control , - , Expires .

Cache-Control :
max-age =[] - , . Expires , , , . [] - , , . s-maxage =[] - max-age , , (.. ). public - , ; , HTTP-, . private - , (.. ) ; (.. ) - . no-cache - , . , , ( public ) . no-store - , . must-revalidate - , , . HTTP ; , , , . proxy-revalidate - must-revalidate , , .
:
Cache-Control: max-age=3600, must-revalidate

, Cache-Control , Expires - , Cache-Control . Cache-Control , HTTP/1.1 .


“ ” , , . , , , , .

; ( Expires Cache-Control ), .

, , Last-Modified . , Last-Modified , () , , , If-Modified-Since .

HTTP/1.1 , ETag . ETag - , , . , ETag , , , ETag If-None-Match , .

Last-Modified ; ETag .

- ETag , Last-Modified , (.. ); . , (, CGI, ASP, ), (. “ , ”).


, , , .

URL- - . , , URL-. . , “/index.html” , . . , , Cache-Control: max-age max-age . , , max-age (expiration time). ( ) , . , , ; , , - , . . , Last-Modified . - , , . , . SSL - ; SSL . REDbot - .

,
-, (. - “” , “”) ( Last-Modified ETag ) ( Expires Cache-Control ). - ( , ), (, , ) .

, , (, ), . , URL-, ; , - , .

- , . - , , . , , Last-Modified . - , , , . Expires , Cache-Control: max-age , . , , If-Modified-Since / If-None-Match . HTTP 304 Not Modified . , .
:
POST, . POST- ; ( GET), . , , URL-, . , , . Content-Length . (persistent connection). TCP/IP , . , , .

" " (. - ).