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4 HTTP (HTTP Message).

4.1 .

HTTP . 

          HTTP-message   = Request | Response    ;  HTTP/1.1

( 5) ( 6) RFC 822 [9] ( ). : (start-line), ( ""), ( , CRLF), , , , . 

           generic-message = start-line
                             *message-header
                             CRLF
                             [ message-body ]

           start-line      = Request-Line | Status-Line

, , (Request-Line). , CRLF, CRLF .

: HTTP/1.0 CRLF POST. , -. HTTP/1.1 CRLF .

4.2 .

HTTP, (general-header) ( 4.5), (request-header) ( 5.3), (response-header) ( 6.2), (entity-header) ( 7.1), , 3.1 RFC 822 [9]. , (":") . . LWS, SP. . SP HT. " " ("common form") HTTP , , - . 

          message-header = field-name ":" [ field-value ] CRLF

          field-name     = token
          field-value    = *( field-content | LWS )

          field-content  = <,    
                               *TEXT   
                            , tspecials,  quoted-string>

, . " " , , , , , .

, , , , [ #(value)]. " : " ( ) . , , , , , - .

4.3 c.

HTTP (message-body), , , . (message-body) (entity-body) , , Transfer-Encoding ( 14.40). 

          message-body = entity-body
                       | <entity-body  
                          Transfer-Encoding>

Transfer-Encoding , . Transfer-Encoding - , , , , /.

, , .

Content-Length Transfer-Encoding. (message-body) (entity-body) ( 5.1.1).

(message-body) , ( 6.1.1). HEAD (message-body), (entity-header), . 1xx (), 204 ( , No Content), 304 ( , Not Modified) (message-body). , .

4.4 .

(message-body) , ( ):

  1. , (message-body) ( 1xx, 204, 304 HEAD) , (entity-header fields), .
  2. Transfer-Encoding ( 14.40) "chunked", (chunked encoding) ( 3.6).
  3. Content-Length ( 14.14) , (message-body) .
  4. "multipart/byteranges", , . , , ; Range (byte-range) , multipart/byteranges .
  5. . ( , ).

HTTP/1.0 HTTP/1.1 , (message-body) Content-Length, , HTTP/1.1 . (message-body), Content-Length , 400 ( , Bad Request), , 411 ( , Length Required), Content-Length.

HTTP/1.1 , , "chunked" ( 3.6), , .

Content-Length "chunked". Content-Length "chunked", Content-Length .

Content-Length , (message-body), . HTTP/1.1 .

4.5 .

, , , . . 

          general-header = Cache-Control            ;  14.9
                         | Connection               ;  14.10
                         | Date                     ;  14.19
                         | Pragma                   ;  14.32
                         | Transfer-Encoding        ;  14.40
                         | Upgrade                  ;  14.41
                         | Via                      ;  14.44

(general-header fields) . , (general-header fields), . (entity-header).

Copyright  ©  1998 Alex Simonoff (http://www.omsk.com/Leshik/), All Rights Reserved.
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