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Request header fields allow the client to pass additional information beyond the request line, acting as request modifiers (similarly to the parameters of a procedure). They give information about the client, about the target resource, or about the expected handling of the request.
A response message is sent by a server to a client as a reply to its former request message.{{refn|group=note|name=http-23-message}}
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* an optional [[HTTP message body|message body]].
{{See also|List of HTTP status codes}}
In HTTP/1.0 and since, the first line of the HTTP response is called the ''status line'' and includes a numeric ''status code'' (such as "[[HTTP 404|404]]") and a textual ''reason phrase'' (such as "Not Found"). The response status code is a three-digit integer code representing the result of the server's attempt to understand and satisfy the client's corresponding request. The way the client handles the response depends primarily on the status code, and secondarily on the other response header fields. Clients may not understand all registered status codes but they must understand their class (given by the first digit of the status code) and treat an unrecognized status code as being equivalent to the x00 status code of that class.
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