Hypertext Transfer Protocol (HTTP)

Hypertext Transfer Protocol is an #Application Layer protocol that is used to manage the request and distribution of the hypertext documents.

Request

To request for hypertext, the client need to specify three things: the HTTP method, the request resource and the version of HTTP. A typical HTTP request could look like this:

GET / HTTP/1.1

Response

The web-server will need to respond to the client’s request. It can indicate that the client does not have the permission to retrieve the resource or simply fetch the requested resource to the client.

Either way, it needs to include the status of the request in HTTP header in the format: the version of HTTP, the status code and the status text. A typical HTTP response would look like this:

HTTP/1.1 200 OK

Implementation

See Socket Programming#

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Well-Known Ports

#Hypertext Transfer Protocol (HTTP)
Socket Programming

Instead of send() data to the socket, one could receive data from the client invoking read() function on the client socket. It is especially useful in determining the validity of the client request such as in #Hypertext Transfer Protocol (HTTP) socket programming. Other than that, the server could send a response to the client by write() instead of read(). The difference is that send() will return error when the message sent is too big for the protocol to handle. Otherwise, in most cases, they are almost identical.
Application Layer

Hypertext Transfer Protocol (HTTP)#