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4.1 Message Types Connected: An Internet Encyclopedia
4.1 Message Types

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4.1 Message Types

4.1 Message Types

HTTP messages consist of requests from client to server and responses from server to client.

          HTTP-message   = Request | Response     ; HTTP/1.1 messages

Request (section 5) and Response (section 6) messages use the generic message format of RFC 822 [9] for transferring entities (the payload of the message). Both types of message consist of a start-line, one or more header fields (also known as "headers"), an empty line (i.e., a line with nothing preceding the CRLF) indicating the end of the header fields, and an optional message-body.

           generic-message = start-line
                             [ message-body ]

           start-line      = Request-Line | Status-Line

In the interest of robustness, servers SHOULD ignore any empty line(s) received where a Request-Line is expected. In other words, if the server is reading the protocol stream at the beginning of a message and receives a CRLF first, it should ignore the CRLF.

    Note: certain buggy HTTP/1.0 client implementations generate an extra CRLF's after a POST request. To restate what is explicitly forbidden by the BNF, an HTTP/1.1 client must not preface or follow a request with an extra CRLF.

Next: 4.2 Message Headers

Connected: An Internet Encyclopedia
4.1 Message Types


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