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<div class="section" id="http-redirects">
<h1><abbr title="Hypertext Transfer Protocol">HTTP</abbr> Redirects<a class="headerlink" href="#http-redirects" title="Permalink to this headline">¶</a></h1>
<p>When you download a feed from a remote web server, <strong class="program">Universal Feed Parser</strong>
exposes the <abbr title="Hypertext Transfer Protocol">HTTP</abbr> status code. You need
to understand the different codes, including permanent and temporary redirects,
and feeds that have been marked “gone”.</p>
<p>When a feed has temporarily moved to a new location, the web server will return
a <tt class="docutils literal"><span class="pre">302</span></tt> status code. <strong class="program">Universal Feed Parser</strong> makes this available
in <tt class="docutils literal"><span class="pre">d.status</span></tt>.</p>
<p>There is nothing special you need to do with temporary redirects; by the time
you learn about it, <strong class="program">Universal Feed Parser</strong> has already followed the
redirect to the new location (available in <tt class="docutils literal"><span class="pre">d.href</span></tt>), downloaded the feed,
and parsed it. Since the redirect is temporary, you should continue requesting
the original <abbr title="Uniform Resource Locator">URL</abbr> the next time you want to
parse the feed.</p>
<div class="section" id="noticing-temporary-redirects">
<h2>Noticing temporary redirects<a class="headerlink" href="#noticing-temporary-redirects" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">feedparser</span>
<span class="gp">>>> </span><span class="n">d</span> <span class="o">=</span> <span class="n">feedparser</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="s">'http://feedparser.org/docs/examples/temporary.xml'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">status</span>
<span class="go">302</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">href</span>
<span class="go">'http://feedparser.org/docs/examples/atom10.xml'</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">feed</span><span class="o">.</span><span class="n">title</span>
<span class="go">u'Sample Feed'</span>
</pre></div>
</div>
<p>When a feed has permanently moved to a new location, the web server will return
a <tt class="docutils literal"><span class="pre">301</span></tt> status code. Again, <strong class="program">Universal Feed Parser</strong> makes this
available in <tt class="docutils literal"><span class="pre">d.status</span></tt>.</p>
<p>If you are polling a feed on a regular basis, it is very important to check the
status code (<tt class="docutils literal"><span class="pre">d.status</span></tt>) every time you download. If the feed has been
permanently redirected, you should update your database or configuration file
with the new address (<tt class="docutils literal"><span class="pre">d.href</span></tt>). Repeatedly requesting the original address
of a feed that has been permanently redirected is very rude, and may get you
banned from the server.</p>
</div>
<div class="section" id="noticing-permanent-redirects">
<h2>Noticing permanent redirects<a class="headerlink" href="#noticing-permanent-redirects" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">feedparser</span>
<span class="gp">>>> </span><span class="n">d</span> <span class="o">=</span> <span class="n">feedparser</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="s">'http://feedparser.org/docs/examples/permanent.xml'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">status</span>
<span class="go">301</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">href</span>
<span class="go">'http://feedparser.org/docs/examples/atom10.xml'</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">feed</span><span class="o">.</span><span class="n">title</span>
<span class="go">u'Sample Feed'</span>
</pre></div>
</div>
<p>When a feed has been permanently deleted, the web server will return a <tt class="docutils literal"><span class="pre">410</span></tt>
status code. If you ever receive a <tt class="docutils literal"><span class="pre">410</span></tt>, you should stop polling the feed
and inform the end user that the feed is gone for good.</p>
<p>Repeatedly requesting a feed that has been marked as “gone” is very rude, and
may get you banned from the server.</p>
</div>
<div class="section" id="noticing-feeds-marked-gone">
<h2>Noticing feeds marked “gone”<a class="headerlink" href="#noticing-feeds-marked-gone" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">feedparser</span>
<span class="gp">>>> </span><span class="n">d</span> <span class="o">=</span> <span class="n">feedparser</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="s">'http://feedparser.org/docs/examples/gone.xml'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">d</span><span class="o">.</span><span class="n">status</span>
<span class="go">410</span>
</pre></div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#"><abbr title="Hypertext Transfer Protocol">HTTP</abbr> Redirects</a><ul>
<li><a class="reference internal" href="#noticing-temporary-redirects">Noticing temporary redirects</a></li>
<li><a class="reference internal" href="#noticing-permanent-redirects">Noticing permanent redirects</a></li>
<li><a class="reference internal" href="#noticing-feeds-marked-gone">Noticing feeds marked “gone”</a></li>
</ul>
</li>
</ul>
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