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