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HTTP Responses

An HTTP response contains a result code, header fields, and a body.

The HTTP protocol expects the result code and all header fields to be returned before any body content.

Some commonly used status codes include:

404 - indicates that the requested resource is not available.
401 - indicates that the request requires HTTP authentication.
500 - indicates an error inside the HTTP server which prevented it from fulfilling the request.
503 - indicates that the HTTP server is temporarily overloaded, and unable to handle the request.

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