HTTP is the network protocol of the Web. It is both simple and powerful. Knowing HTTP enables you to write Web browsers, Web servers, automatic page downloaders, link-checkers, and other useful tools.
ion at bottom) focuses on C, but the underlying concepts are language-independent.
Before getting started, understand the following two paragraphs:
<LECTURE>
Writing HTTP or other network programs requires more care than programming for a single machine. Of course, you have to follow standards, or no one will understand you. But even more important is the burden you place on other machines. Write a bad program for your own machine, and you waste your own resources (CPU time, bandwidth, memory). Write a bad network program, and you waste other people's resources. Write a really bad network program, and you waste many thousands of people's resources at the same time. Sloppy and malicious network programming forces network standards to be modified, made safer but less efficient. So be careful, respectful, and cooperative, for everyone's sake.
In particular, don't be tempted to write programs that automatically follow Web links (called robots or spiders) before you really know what you're doing. They can be useful, but a badly-written robot is one of the worst kinds of programs on the Web, blindly following a rapidly increasing number of links and quickly draining server resources. If you plan to write anything like a robot, please read more about them. There may already be a working program to do what you want. If you really need to write your own, read these guidelines. Definitely support the current Standard for Robot Exclusion, and stay tuned for further developments.
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