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J2EE™ Tutorial, The by Beth Stearns, Monica Pawlan, Eric Jendrock, Kim Haase, Dale Green, Stephanie Bodoff

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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 the following:

  • 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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