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<title>Joe Gregorio | BitWorking | Projects | httplib2.py</title>

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<div>

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<h2>Httplib2</h2>

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<p>A comprehensive HTTP client library, <code>httplib2.py</code>

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supports many features left out of other HTTP libraries.

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</p>

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<dl>

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<dt>HTTP and HTTPS</dt>

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<dd>HTTPS support is only available if the socket module was compiled with SSL support.

</dd>

<dt>Keep-Alive</dt>

<dd>Supports HTTP 1.1 Keep-Alive, keeping the socket

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open and performing multiple requests over the same connection

if possible.

</dd>

<dt>Authentication</dt>

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<dd>The following types of HTTP Authentication are supported.

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These can be used over both HTTP and HTTPS.

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<ul>

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<li><a href="http://www.faqs.org/rfcs/rfc2617.html">Digest</a></li>

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<li><a href="http://www.faqs.org/rfcs/rfc2617.html">Basic</a></li>

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<li><a href="http://franklinmint.fm/2006/02/28/draft-sayre-http-hmac-digest.html">HMAC Digest</a></li>

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<li><a href="http://code.google.com/apis/accounts/AuthForInstalledApps.html">Google Account Authentication</a></li>

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</ul>

</dd>

<dt>Caching</dt>

<dd>The module can optionally operate with a private

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cache that understands the Cache-Control: header and

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uses both the ETag and Last-Modified cache validators.

</dd>

<dt>All Methods</dt>

<dd>The module can handle any HTTP request method, not just GET and POST.</dd>

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<dt>Redirects</dt>

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<dd>Automatically follows 3XX redirects on GETs.</dd>

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<dt>Compression</dt>

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<dd>Handles both 'deflate' and 'gzip' types of compression.</dd>

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<dt>Lost update support</dt>

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<dd>Automatically adds back ETags into PUT requests to resources

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we have already cached. This implements Section 3.2 of

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<a href="http://www.w3.org/1999/04/Editing/#Table">Detecting the Lost Update Problem Using Unreserved Checkout</a></dd>

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<dt>Unit Tested</dt>

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<dd>A large and growing set of unit tests.</dd>

</dl>

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<h3>Usage</h3>

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<p>A simple retrieval:</p>

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<pre><code>import httplib2

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h = httplib2.Http(".cache")

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resp, content = h.request("http://example.org/", "GET")

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</code></pre>

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<p>The 'content' is the content retrieved from the URL.

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The content is already decompressed or unzipped if necessary.

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The 'resp' contains all the response headers.

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</p>

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<p>To PUT some content to a server that uses SSL

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and Basic authentication:</p>

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<pre><code>import httplib2

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h = httplib2.Http(".cache")

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h.add_credentials('name', 'password')

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resp, content = h.request("https://example.org/chap/2",

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"PUT", body="This is text",

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headers={'content-type':'text/plain'} )

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</code></pre>

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<p>Use the Cache-Control: header to control

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how the caching operates.</p>

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<pre><code>import httplib2

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h = httplib2.Http(".cache")

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resp, content = h.request("http://bitworking.org/")

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...

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resp, content = h.request("http://bitworking.org/",

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headers={'cache-control':'no-cache'})

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</code></pre>

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<p>The first request will be cached and since this is a request to

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bitworking.org it will be set to be cached for two hours, because

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that is how I have my server configured.

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Any subsequent GET to that URI will return the value from the

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on-disk cache and no request will be made to the server.

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You can use the Cache-Control: header to change the caches behavior and

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in this example the second request adds the Cache-Control: header with a value

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of 'no-cache' which tells the library that the cached copy

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must not be used when handling this request.

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</p>

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<h3>Requirements</h3>

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<p>Requires Python 2.3 or later. Does not require

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any libraries beyond what is found in the core library.</p>

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<h3>Download/Installation</h3>

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<p>The latest release of httplib2 is 0.2.0 and

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can be <a href="dist">downloaded from the from

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the dist directory</a>. See the

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<a href="CHANGELOG">CHANGELOG</a> for what's new in this

version.</p>

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<p>The httplib2 module is shipped as a distutils package. To install

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the library, first unpack the distribution archive, and issue the following

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command:</p>

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<pre><code>$ python setup.py install</code></pre>

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<p><a href="dist">Download the distribution archives from here</a>. </p>

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<p> <a href="test">The resources used in the unit test cases</a>

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are available also. More documentation on them will be forthcoming.</p>

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<p>You can also get the sources directly from the SourceForge hosted

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subversion repository.</p>

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<pre>svn co https://svn.sourceforge.net/svnroot/httplib2/trunk httplib2</pre>

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<h3>Documentation</h3>

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<p>In addition to the <a href="ref/">Python library style documentation</a> there

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are also two articles on XML.com, <a href="http://www.xml.com/pub/a/2006/02/01/doing-http-caching-right-introducing-httplib2.html">

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Doing HTTP Caching Right: Introducing httplib2</a> and

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httplib2: HTTP Persistence and Authentication </a>.

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</p>

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<h3>Feedback</h3>

<p>Bugs and enhancement requests are handled through

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<a href="http://sourceforge.net/projects/httplib2/">SourceForge</a>, and anything is up for discussion

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on the <a href="http://sourceforge.net/mail/?group_id=161082">httplib2 mailing list</a>.

</p>

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<p>This module is not perfect and needs the following:</p>

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<ul>

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<li>Support for Proxies</li>

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<li><del>A pluggable store for the cache.</del> Right now the store is just flat files in a directory.

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I would like to have plugins that allow keeping the cache in Berkeley DB, <del>memcached</del>, Squid, MySQL, etc.</li>

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<li>More unit tests</li>

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</ul>

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<h3>Project Goal</h3>

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<p>To become a worthy addition to the Python core library.</p>

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<h3>Additional Information</h3>

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<p>

<dl>

<dt>Author</dt>

<dd>Joe Gregorio</dd>

<dt>License</dt>

<dt>Contributors</dt>

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<dd> Thomas Broyer (t.broyer@ltgt.net) </dd>

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<dd> James Antill </dd>

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<dd> Xavier Verges Farrero </dd>

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<dd> Jonathan Feinberg </dd>

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<dd> Blair Zajac </dd>

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</dl>

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</p>

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<p style="font-size: small">This page last updated on: $LastChangedDate$.</p>

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