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HTTP Response occurs on Hypertext Transfer Protocol (HTTP) after receiving and interpreting a Hypertext transfer protocol (HTTP) Request message, a Server or Service responds with a response.

Source: https://www.tutorialspoint.com/http/http_responses.htm

Figure 1: The HTTP Response

An HTTP Response has four major parts −

• Status/Response Code − Indicates the Server status for the requested resource. For example, 404 means resource not found and 200 means response is ok.
• HTTP Version − Indicates the HTTP version. For example HTTP v1.1.
• Response Header − Contains metadata for the HTTP Response message as key value pairs. For example, content length, content type, response date, server type, etc.
• Response Body − Response message content or Resource representation.

Source: https://www.tutorialspoint.com/restful/restful_messages.htm