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* an optional [[HTTP message body|message body]].
block=== Response status codes ===
{{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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