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GET and POST are the most frequent request methods, although there are many others, such as HEAD, PUT, DELETE, CONNECT, and OPTIONS. Support for alternative methods is occasionally restricted but expanding, whereas GET and POST are universally supported.

POST, GET, PUT, PATCH, and DELETE are the most regularly used HTTP methods.

HTTP headers allow the client and server to send extra data with an HTTP request or response. The name of an HTTP header is case-insensitive, followed by a colon (:), and then the value. The value is ignored if there is any whitespace before it.

HTTP is a request-response protocol that communicates between a client and a server. A client (browser) sends an HTTP request to the server, which is then responded to by the server. The answer may include the requested content as well as status information about the request.

GET, HEAD, and OPTIONS are three common HTTP methods that are safe. Not all idempotent methods are safe, and not all safe methods are idempotent. PUT and DELETE, for example, are both idempotent but dangerous. Servers can change their state, even if safe methods have a read-only semantic: for example, they can record or keep statistics.

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