An HTTP request consists of a request method, a request URL, header fields, and a body. HTTP 1.1 defines the following request methods:
GET: Retrieves the resource identified by the request URLHEAD: Returns the headers identified by the request URLPOST: Sends data of unlimited length to the Web serverPUT: Stores a resource under the request URLDELETE: Removes the resource identified by the request URLOPTIONS: Returns the HTTP methods the server supportsTRACE: Returns the header fields sent with the TRACE request
HTTP 1.0 includes only the GET, HEAD, and POST methods.
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 available401: Indicates that the request requires HTTP authentication500: Indicates an error inside the HTTP server which prevented it from fulfilling the request503: Indicates that the HTTP server is temporarily overloaded, and unable to handle the request
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