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TCP/IP Guide by Charles M. Kozierok

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Chapter 82. HTTP MESSAGE HEADERS

As you have seen in the preceding two chapters, Hypertext Transfer Protocol (HTTP) communication takes place through the relatively simple exchange of request and response messages. There are only a small number of methods (commands) supported by the protocol, which might give you the impression that the protocol is quite limited. Looks can be deceiving, however. Much of the functionality in HTTP is actually implemented in the form of message headers, which convey important details between clients and servers.

Some headers can appear in only HTTP requests, some in only HTTP responses, and some in either type of message. ...

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