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 <h1><a name="SECTION002100000000000000000">
 1.1 <tt class="module">httplib2</tt>
          A comprehensive HTTP client library.  </a>
 </h1>

 <p>
 <a name="module-httplib2"></a>
 <p>

 <p>

 <p>
 The <tt class="module">httplib2</tt> module is a comprehensive HTTP client library with the following features:

 <p>
 <dl>
 <dt><strong>HTTP and HTTPS</strong></dt>
 <dd>HTTPS support is only available if the socket module was compiled with SSL support.
 </dd>
 <dt><strong>Keep-Alive</strong></dt>
 <dd>Supports HTTP 1.1 Keep-Alive, keeping the socket open and performing multiple requests over the same connection if possible.
 </dd>
 <dt><strong>Authentication</strong></dt>
 <dd>The following three types of HTTP Authentication are supported. These can be used over both HTTP and HTTPS.

 <ul>
 <li>Digest
 </li>
 <li>Basic
 </li>
 <li>WSSE

 </li>
 </ul>
 </dd>
 <dt><strong>Caching</strong></dt>
 <dd>The module can optionally operate with a private cache that understands the Cache-Control: header and uses both the ETag and Last-Modified cache validators.
 </dd>
 <dt><strong>All Methods</strong></dt>
 <dd>The module can handle any HTTP request method, not just GET and POST.
 </dd>
 <dt><strong>Redirects</strong></dt>
 <dd>Automatically follows 3XX redirects on GETs.
 </dd>
 <dt><strong>Compression</strong></dt>
 <dd>Handles both 'deflate' and 'gzip' types of compression.
 </dd>
 <dt><strong>Proxies</strong></dt>
 <dd>If the Socksipy module is installed then httplib2 can handle sock4, sock5 and http proxies.
 </dd>
 <dt><strong>Lost update support</strong></dt>
 <dd>Automatically adds back ETags into PUT requests to resources we have already cached. This implements Section 3.2 of Detecting the Lost Update Problem Using Unreserved Checkout
 </dd>
 </dl>

 <p>
 The <tt class="module">httplib2</tt> module defines the following variables:

 <p>
 <dl><dt><b><tt id='l2h-2' xml:id='l2h-2'>debuglevel</tt></b></dt>
 <dd>
 The amount of debugging information to print. The default is 0.
 </dd></dl>

 <p>
 The <tt class="module">httplib2</tt> module may raise the following Exceptions. Note that
 there is an option that turns exceptions into
 normal responses with an HTTP status code indicating
 an error occured. See <tt class="member">Http.force_exception_to_status_code</tt>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-3' xml:id='l2h-3' class="exception">HttpLib2Error</tt></b></dt>
 <dd>
 The Base Exception for all exceptions raised by httplib2.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-4' xml:id='l2h-4' class="exception">RedirectMissingLocation</tt></b></dt>
 <dd>
 A 3xx redirect response code was provided but no Location: header
 was provided to point to the new location.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-5' xml:id='l2h-5' class="exception">RedirectLimit</tt></b></dt>
 <dd>
 The maximum number of redirections was reached without coming to a final URI.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-6' xml:id='l2h-6' class="exception">ServerNotFoundError</tt></b></dt>
 <dd>
 Unable to resolve the host name given.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-7' xml:id='l2h-7' class="exception">RelativeURIError</tt></b></dt>
 <dd>
 A relative, as opposed to an absolute URI, was passed into request().
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-8' xml:id='l2h-8' class="exception">FailedToDecompressContent</tt></b></dt>
 <dd>
 The headers claimed that the content of the response was compressed but the
 decompression algorithm applied to the content failed.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-9' xml:id='l2h-9' class="exception">UnimplementedDigestAuthOptionError</tt></b></dt>
 <dd>
 The server requested a type of Digest authentication that we
 are unfamiliar with.
 </dd></dl>

 <p>
 <dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-10' xml:id='l2h-10' class="exception">UnimplementedHmacDigestAuthOptionError</tt></b></dt>
 <dd>
 The server requested a type of HMACDigest authentication that we
 are unfamiliar with.
 </dd></dl>

 <p>
 <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
   <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-11' xml:id='l2h-11' class="class">Http</tt></b>(</nobr></td>
   <td><var></var><big>[</big><var>cache=None</var><big>]</big><var>, </var><big>[</big><var>timeout=None</var><big>]</big><var>, </var><big>[</big><var>proxy_info=None</var><big>]</big><var></var>)</td></tr></table></dt>
 <dd>
 The class that represents a client HTTP interface.
 The <var>cache</var> parameter is either the name of a directory
 to be used as a flat file cache, or it must an object that
 implements the required caching interface.
 The <var>timeout</var> parameter is the socket level timeout.
 The <var>proxy_info</var> is an instance of <tt class="class">ProxyInfo</tt> and is supplied
 if a proxy is to be used. Note that the Socksipy module must be
 installed for proxy support to work.
 </dl>

 <p>
 <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
   <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-12' xml:id='l2h-12' class="class">Response</tt></b>(</nobr></td>
   <td><var>info</var>)</td></tr></table></dt>
 <dd>
 Response is a subclass of <tt class="class">dict</tt> and instances of this
 class are returned from calls
 to Http.request. The <var>info</var> parameter is either
 an <tt class="class">rfc822.Message</tt> or an <tt class="class">httplib.HTTPResponse</tt> object.
 </dl>

 <p>
 <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
   <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-13' xml:id='l2h-13' class="class">FileCache</tt></b>(</nobr></td>
   <td><var>dir_name, </var><big>[</big><var>safe=safename</var><big>]</big><var></var>)</td></tr></table></dt>
 <dd>
 FileCache implements a Cache as a directory of files.
 The <var>dir_name</var> parameter is
 the name of the directory to use. If the directory does
 not exist then FileCache attempts to create the directory.
 The optional <var>safe</var> parameter is a funtion which generates
 the cache filename for each URI. A FileCache object is
 constructed and used for caching when you pass a directory name
 into the constructor of <tt class="class">Http</tt>.
 </dl>

 <p>
 <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
   <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-14' xml:id='l2h-14' class="class">ProxyInfo</tt></b>(</nobr></td>
   <td><var>proxy_type, proxy_host, proxy_port, </var><big>[</big><var>proxy_rdns=None</var><big>]</big><var>, </var><big>[</big><var>proxy_user=None</var><big>]</big><var>, </var><big>[</big><var>proxy_pass=None</var><big>]</big><var></var>)</td></tr></table></dt>
 <dd>
 The parameter <var>proxy_type</var> must be set to one of socks.PROXY_TYPE_XXX
 constants. The <var>proxy_host</var> and <var>proxy_port</var> must be set to the location
 of the proxy. The optional <var>proxy_rdns</var> should be set to True if
 the DNS server on the proxy should be used. The <var>proxy_user</var> and
 <var>proxy_pass</var> are supplied when the proxy is protected by authentication.
 </dl>

 <p>

 <p><br /></p><hr class='online-navigation' />
 <div class='online-navigation'>
 <!--Table of Child-Links-->
 <a name="CHILD_LINKS"><strong>Subsections</strong></a>

 <ul class="ChildLinks">
 <li><a href="http-objects.html">1.1.1 Http Objects</a>
 <li><a href="cache-objects.html">1.1.2 Cache Objects</a>
 <li><a href="response-objects.html">1.1.3 Response Objects</a>
 <li><a href="httplib2-example.html">1.1.4 Examples</a>
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	<h1><a name="SECTION002100000000000000000">
	1.1 <tt class="module">httplib2</tt>
	A comprehensive HTTP client library. </a>
	</h1>

	<p>
	<a name="module-httplib2"></a>
	<p>

	<p>

	<p>
	The <tt class="module">httplib2</tt> module is a comprehensive HTTP client library with the following features:

	<p>
	<dl>
	<dt><strong>HTTP and HTTPS</strong></dt>
	<dd>HTTPS support is only available if the socket module was compiled with SSL support.
	</dd>
	<dt><strong>Keep-Alive</strong></dt>
	<dd>Supports HTTP 1.1 Keep-Alive, keeping the socket open and performing multiple requests over the same connection if possible.
	</dd>
	<dt><strong>Authentication</strong></dt>
	<dd>The following three types of HTTP Authentication are supported. These can be used over both HTTP and HTTPS.

	<ul>
	<li>Digest
	</li>
	<li>Basic
	</li>
	<li>WSSE

	</li>
	</ul>
	</dd>
	<dt><strong>Caching</strong></dt>
	<dd>The module can optionally operate with a private cache that understands the Cache-Control: header and uses both the ETag and Last-Modified cache validators.
	</dd>
	<dt><strong>All Methods</strong></dt>
	<dd>The module can handle any HTTP request method, not just GET and POST.
	</dd>
	<dt><strong>Redirects</strong></dt>
	<dd>Automatically follows 3XX redirects on GETs.
	</dd>
	<dt><strong>Compression</strong></dt>
	<dd>Handles both 'deflate' and 'gzip' types of compression.
	</dd>
	<dt><strong>Proxies</strong></dt>
	<dd>If the Socksipy module is installed then httplib2 can handle sock4, sock5 and http proxies.
	</dd>
	<dt><strong>Lost update support</strong></dt>
	<dd>Automatically adds back ETags into PUT requests to resources we have already cached. This implements Section 3.2 of Detecting the Lost Update Problem Using Unreserved Checkout
	</dd>
	</dl>

	<p>
	The <tt class="module">httplib2</tt> module defines the following variables:

	<p>
	<dl><dt><b><tt id='l2h-2' xml:id='l2h-2'>debuglevel</tt></b></dt>
	<dd>
	The amount of debugging information to print. The default is 0.
	</dd></dl>

	<p>
	The <tt class="module">httplib2</tt> module may raise the following Exceptions. Note that
	there is an option that turns exceptions into
	normal responses with an HTTP status code indicating
	an error occured. See <tt class="member">Http.force_exception_to_status_code</tt>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-3' xml:id='l2h-3' class="exception">HttpLib2Error</tt></b></dt>
	<dd>
	The Base Exception for all exceptions raised by httplib2.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4' xml:id='l2h-4' class="exception">RedirectMissingLocation</tt></b></dt>
	<dd>
	A 3xx redirect response code was provided but no Location: header
	was provided to point to the new location.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-5' xml:id='l2h-5' class="exception">RedirectLimit</tt></b></dt>
	<dd>
	The maximum number of redirections was reached without coming to a final URI.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-6' xml:id='l2h-6' class="exception">ServerNotFoundError</tt></b></dt>
	<dd>
	Unable to resolve the host name given.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-7' xml:id='l2h-7' class="exception">RelativeURIError</tt></b></dt>
	<dd>
	A relative, as opposed to an absolute URI, was passed into request().
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-8' xml:id='l2h-8' class="exception">FailedToDecompressContent</tt></b></dt>
	<dd>
	The headers claimed that the content of the response was compressed but the
	decompression algorithm applied to the content failed.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-9' xml:id='l2h-9' class="exception">UnimplementedDigestAuthOptionError</tt></b></dt>
	<dd>
	The server requested a type of Digest authentication that we
	are unfamiliar with.
	</dd></dl>

	<p>
	<dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-10' xml:id='l2h-10' class="exception">UnimplementedHmacDigestAuthOptionError</tt></b></dt>
	<dd>
	The server requested a type of HMACDigest authentication that we
	are unfamiliar with.
	</dd></dl>

	<p>
	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
	<td><nobr><b><span class="typelabel">class</span> <tt id='l2h-11' xml:id='l2h-11' class="class">Http</tt></b>(</nobr></td>
	<td><var></var><big>[</big><var>cache=None</var><big>]</big><var>, </var><big>[</big><var>timeout=None</var><big>]</big><var>, </var><big>[</big><var>proxy_info=None</var><big>]</big><var></var>)</td></tr></table></dt>
	<dd>
	The class that represents a client HTTP interface.
	The <var>cache</var> parameter is either the name of a directory
	to be used as a flat file cache, or it must an object that
	implements the required caching interface.
	The <var>timeout</var> parameter is the socket level timeout.
	The <var>proxy_info</var> is an instance of <tt class="class">ProxyInfo</tt> and is supplied
	if a proxy is to be used. Note that the Socksipy module must be
	installed for proxy support to work.
	</dl>

	<p>
	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
	<td><nobr><b><span class="typelabel">class</span> <tt id='l2h-12' xml:id='l2h-12' class="class">Response</tt></b>(</nobr></td>
	<td><var>info</var>)</td></tr></table></dt>
	<dd>
	Response is a subclass of <tt class="class">dict</tt> and instances of this
	class are returned from calls
	to Http.request. The <var>info</var> parameter is either
	an <tt class="class">rfc822.Message</tt> or an <tt class="class">httplib.HTTPResponse</tt> object.
	</dl>

	<p>
	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
	<td><nobr><b><span class="typelabel">class</span> <tt id='l2h-13' xml:id='l2h-13' class="class">FileCache</tt></b>(</nobr></td>
	<td><var>dir_name, </var><big>[</big><var>safe=safename</var><big>]</big><var></var>)</td></tr></table></dt>
	<dd>
	FileCache implements a Cache as a directory of files.
	The <var>dir_name</var> parameter is
	the name of the directory to use. If the directory does
	not exist then FileCache attempts to create the directory.
	The optional <var>safe</var> parameter is a funtion which generates
	the cache filename for each URI. A FileCache object is
	constructed and used for caching when you pass a directory name
	into the constructor of <tt class="class">Http</tt>.
	</dl>

	<p>
	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
	<td><nobr><b><span class="typelabel">class</span> <tt id='l2h-14' xml:id='l2h-14' class="class">ProxyInfo</tt></b>(</nobr></td>
	<td><var>proxy_type, proxy_host, proxy_port, </var><big>[</big><var>proxy_rdns=None</var><big>]</big><var>, </var><big>[</big><var>proxy_user=None</var><big>]</big><var>, </var><big>[</big><var>proxy_pass=None</var><big>]</big><var></var>)</td></tr></table></dt>
	<dd>
	The parameter <var>proxy_type</var> must be set to one of socks.PROXY_TYPE_XXX
	constants. The <var>proxy_host</var> and <var>proxy_port</var> must be set to the location
	of the proxy. The optional <var>proxy_rdns</var> should be set to True if
	the DNS server on the proxy should be used. The <var>proxy_user</var> and
	<var>proxy_pass</var> are supplied when the proxy is protected by authentication.
	</dl>

	<p>

	<p><br /></p><hr class='online-navigation' />
	<div class='online-navigation'>
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	<a name="CHILD_LINKS"><strong>Subsections</strong></a>

	<ul class="ChildLinks">
	<li><a href="http-objects.html">1.1.1 Http Objects</a>
	<li><a href="cache-objects.html">1.1.2 Cache Objects</a>
	<li><a href="response-objects.html">1.1.3 Response Objects</a>
	<li><a href="httplib2-example.html">1.1.4 Examples</a>
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	<span class="release-info">Release 0.3, documentation updated on Mar 8, 2007.</span>
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