April 2017
Beginner
504 pages
14h 11m
English
Content preview from Java 9 Programming By Example
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The HTTP protocol
The Hypertext Transport Protocol (HTTP) is built on top of the TCP. When you type a URL in a browser, the browser opens a TCP channel to the server (after DNS lookup, of course) and sends a HTTP request to the web server. The server, after receiving the request, produces a response and sends it to the client. After that, the TCP channel may be closed or kept alive for further HTTP request-response pairs.
Both the request and the response contain a header and an optional (possibly zero-length) body. The header is in the text format, and it is separated from the body by an empty line.
More precisely the header and the body are separated by four bytes: 0x0D, 0x0A, 0x0D, and 0x0A, which are two CR, LF line separators. The HTTP ...
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