HTTP Response

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External

Internal

Overview

A HTTP response consists of a status line, followed by an optional set of headers, followed by blank line followed by an optional message body.

This is a simple example:

HTTP/1.1 200 OK
Content-Type: text/html
HttpServer: Test Server
Content-Length: 1024

...
...

The Response Status Line

The status line starts with the protocol version followed by a numeric status code and its associated reason phrase, with each element separated by space. No CR or LF is allowed except in the final CRLF sequence.

Example:

HTTP/1.1 200 OK

Protocol Version

Status Code

The status code is also called response code.

For more details about the status code, see

HTTP Status Codes

Reason Phrase

The Headers

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
http://en.wikipedia.org/wiki/List_of_HTTP_headers

The headers included with a response are part of one of the following category:

General Headers

General Headers

Response Headers

The response headers allow the server to pass additional information about the response which cannot be placed in the status line.

Entity Headers

Entity Headers

The Blank Line

The HTTP Response Body

The optional response body is referred to as the HTTP entity:

HTTP Entity