18HTTP AND FORMS
The Hypertext Transfer Protocol, already mentioned in Chapter 13, is the mechanism through which data is requested and provided on the World Wide Web. This chapter describes the protocol in more detail and explains the way browser JavaScript has access to it.
The Protocol
If you type eloquentjavascript.net/18_http.html into your browser’s address bar, the browser first looks up the address of the server associated with eloquentjavascript.net and tries to open a TCP connection to it on port 80, the default port for HTTP traffic. If the server exists and accepts the connection, the browser might send something like this:
GET /18_http.html HTTP/1.1Host: eloquentjavascript.netUser-Agent: Your browser's name
Then the server responds, ...
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