Very similar to the request structure, responses also contain a start-line that is designated as the response status-line. The response may include a message body and header fields, just as the request message is capable of doing. The following data is included within the response line:
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HTTP-Version (RFC-7230 2.6): Similar to the request HTTP-Version field in the request-line, the HTTP-Version is the protocol major and minor version in which the server is responding.
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Status-Code (RFC-7231 6): The response status-code is a three-digit integer code that explains the response of the server. There are five different classes of status codes, namely informational (1xx), successful (2xx), redirection (3xx), client Error (4xx) ...
