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<?xml version="1.0" encoding="utf-8"?><!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'><html lang="en" xmlns="http://www.w3.org/1999/xhtml">
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<title>Twisted Documentation: Overview of Twisted Web</title>
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<link href="stylesheet.css" rel="stylesheet" type="text/css"/>
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<h1 class="title">Overview of Twisted Web</h1>
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<div class="toc"><ol><li><a href="#auto0">Introduction</a></li><li><a href="#auto1">Twisted Web's Structure</a></li><li><a href="#auto2">Resources</a></li><li><a href="#auto3">
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Web programming with Twisted Web
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<h2>Introduction<a name="auto0"/></h2>
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<p>Twisted Web is a web application server written in pure
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Python, with APIs at multiple levels of abstraction to
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facilitate different kinds of web programming.
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<h2>Twisted Web's Structure<a name="auto1"/></h2>
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<p><img src="../img/web-overview.png"/></p>
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the Web Server receives a request from a Client, it creates
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a Request object and passes it on to the Resource system.
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The Resource system dispatches to the appropriate Resource
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object based on what path was requested by the client. The
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Resource is asked to render itself, and the result is
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returned to the client.</p>
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<h2>Resources<a name="auto2"/></h2>
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<p>Resources are the lowest-level abstraction for applications
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in the Twisted web server. Each Resource is a 1:1 mapping with
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a path that is requested: you can think of a Resource as a
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single <q>page</q> to be rendered. The interface for making
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Resources is very simple; they must have a method named
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<code>render</code> which takes a single argument, which is the
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Request object (an instance of <code class="API"><a href="http://twistedmatrix.com/documents/10.0.0/api/twisted.web.server.Request.html" title="twisted.web.server.Request">twisted.web.server.Request</a></code>). This render
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method must return a string, which will be returned to the web
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browser making the request. Alternatively, they can return a
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special constant, <code class="API"><a href="http://twistedmatrix.com/documents/10.0.0/api/twisted.web.server.NOT_DONE_YET.html" title="twisted.web.server.NOT_DONE_YET">twisted.web.server.NOT_DONE_YET</a></code>, which tells
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the web server not to close the connection; you must then use
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<code class="python">request.write(data)</code> to render the
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page, and call <code class="python">request.finish()</code>
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Web programming with Twisted Web
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<a name="auto3"/></h2>
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Web programmers seeking a higher level abstraction than the Resource system
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should look at <a href="http://divmod.org/trac/wiki/DivmodNevow" shape="rect">Nevow</a>.
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Nevow is based on ideas previously developed in Twisted, but is now maintained
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outside of Twisted to easy development and release cycle pressures.
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<p><a href="index.html">Index</a></p>
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<span class="version">Version: 10.0.0</span>
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