103 lines
2.5 KiB
HTML
103 lines
2.5 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<!-- HTTP.html (C) K. J. Turner 18/12/14 -->
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>HyperText Transfer Protocol</title>
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<link rev="made" href="http://www.cs.stir.ac.uk/~kjt/"/>
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</head>
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<body background="simulator.jpeg">
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<div style="text-align: center">
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<h1>HyperText Transfer Protocol Simulator
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</h1>
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<img src="simulator.gif" alt="Simulator Logo"/>
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</div>
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<h2>Protocol Description</h2>
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<p>
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HTTP (Hypertext Transfer Protocol) is familiar as the mechanism for
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delivering web pages. HTTP operates over <a href="TCPcs.html">TCP
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(Transmission Control Protocol)</a> in client-server mode for reliable
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transfer of data. URLs (Uniform Resource Locators) and information
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contents are represented symbolically in the simulation (URL<em>n</em>,
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DATA<em>n</em>). The protocol simulation deals with the main commands:
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</p>
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<ul>
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<li><em>GET</em>: get data for URL</li>
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<li><em>HEAD</em>: get header for URL</li>
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<li><em>POST</em>: append data to URL</li>
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<li>x<em>PUT</em>: send data to URL</li>
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</ul>
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<p>
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The simulation supports a limited range of response codes:
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</p>
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<ul>
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<li><em>200 OK</em>: the command completed successfully</li>
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<li><em>301 MOVED</em>: the requested URL has moved to another location</li>
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<li>
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<em>400 ERROR</em>: the command encountered an error (not explicit in
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the simulation)
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</li>
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</ul>
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<p>
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The protocol simulation shows a time-sequence diagram with client and
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server protocol entities, and a communications medium that carries
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messages. The client sends a one of the above commands and a URL. The
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server makes one of the above replies. Since the medium is assumed to be
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reliable, messages are never lost (though they may be delayed).
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</p>
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<h2>Protocol Parameters</h2>
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<p>
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This simulation has no parameters.
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</p>
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<h2>Protocol Simulation</h2>
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<center>
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<applet code="simulator.ProtocolSimulator.class"
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archive="ProtocolSimulator.jar" width="600" height="700"
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name="ProtocolSimulator">
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<param name="protocol" value="HTTP"/>
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</applet>
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</center>
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<hr/>
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<p>
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<a href="index.html"><img src="uparrow.gif" alt="Up Arrow"/></a>
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Up one level to <a href="index.html">Protocol Simulators</a>
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</p>
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</body>
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</html>
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