A HyperText Transfer Protocol Primer
HTTP[100] is a surprisingly straightforward, text-based protocol built on top of TCP/IP. A client for this protocol connects to an HTTP-capable service on a remote server and makes a request, asking for a specific resource on the server. An HTTP request includes the following parameters in the first line of a query:
A method for accessing the resource. Most often, the client simply asks to retrieve a file, by issuing a GET request (though other methods exist for tasks such as submitting form data, performing diagnostics, storing data on a server, or executing certain extensions).
A universal resource identifier (URI). This is a path to a static file or to a dynamic executable that is the subject of the request. ...
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