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 URL
HEAD
: Returns the headers identified by the request URL
POST
: Sends data of unlimited length to the Web server
PUT
: Stores a resource under the request URL
DELETE
: Removes the resource identified by the request URL
OPTIONS
: Returns the HTTP methods the server supports
TRACE
: 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 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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