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<H1><A NAME="SECTION00132200000000000000000">
11.22 <tt class="module">xmlrpclib</tt> -- XML-RPC client access</A>
</H1>

<P>
<A NAME="module-xmlrpclib"></A>

<P>

<span class="versionnote">New in version 2.2.</span>

<P>
XML-RPC is a Remote Procedure Call method that uses XML passed via
HTTP as a transport.  With it, a client can call methods with
parameters on a remote server (the server is named by a URI) and get back
structured data.  This module supports writing XML-RPC client code; it
handles all the details of translating between conformable Python
objects and XML on the wire.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-3698' xml:id='l2h-3698' class="class">ServerProxy</tt></b>(</nobr></td>
  <td><var>uri</var><big>[</big><var>, transport</var><big>[</big><var>,
                               encoding</var><big>[</big><var>, verbose</var><big>[</big><var>, 
                               allow_none</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
A <tt class="class">ServerProxy</tt> instance is an object that manages communication
with a remote XML-RPC server.  The required first argument is a URI
(Uniform Resource Indicator), and will normally be the URL of the
server.  The optional second argument is a transport factory instance;
by default it is an internal <tt class="class">SafeTransport</tt> instance for https:
URLs and an internal HTTP <tt class="class">Transport</tt> instance otherwise.  The
optional third argument is an encoding, by default UTF-8. The optional
fourth argument is a debugging flag.  If <var>allow_none</var> is true, 
the Python constant <code>None</code> will be translated into XML; the
default behaviour is for <code>None</code> to raise a <tt class="exception">TypeError</tt>.
This is a commonly-used extension to the XML-RPC specification, but isn't
supported by all clients and servers; see
<a class="url" href="http://ontosys.com/xml-rpc/extensions.php">http://ontosys.com/xml-rpc/extensions.php</a> for a description. 

<P>
Both the HTTP and HTTPS transports support the URL syntax extension for
HTTP Basic Authentication: <code>http://user:pass@host:port/path</code>.  The 
<code>user:pass</code> portion will be base64-encoded as an HTTP `Authorization'
header, and sent to the remote server as part of the connection process
when invoking an XML-RPC method.  You only need to use this if the
remote server requires a Basic Authentication user and password.

<P>
The returned instance is a proxy object with methods that can be used
to invoke corresponding RPC calls on the remote server.  If the remote
server supports the introspection API, the proxy can also be used to query
the remote server for the methods it supports (service discovery) and
fetch other server-associated metadata.

<P>
<tt class="class">ServerProxy</tt> instance methods take Python basic types and objects as 
arguments and return Python basic types and classes.  Types that are
conformable (e.g. that can be marshalled through XML), include the
following (and except where noted, they are unmarshalled as the same
Python type):

<P>
<div class="center"><table class="realtable">
  <thead>
    <tr>
      <th class="left"  >Name</th>
      <th class="left"  >Meaning</th>
      </tr>
    </thead>
  <tbody>
    <tr><td class="left"   valign="baseline"><tt class="constant">boolean</tt></td>
        <td class="left"  >The <tt class="constant">True</tt> and <tt class="constant">False</tt> constants</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">integers</tt></td>
        <td class="left"  >Pass in directly</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">floating-point numbers</tt></td>
        <td class="left"  >Pass in directly</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">strings</tt></td>
        <td class="left"  >Pass in directly</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">arrays</tt></td>
        <td class="left"  >Any Python sequence type containing conformable
                  elements. Arrays are returned as lists</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">structures</tt></td>
        <td class="left"  >A Python dictionary. Keys must be strings,
                      values may be any conformable type.</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">dates</tt></td>
        <td class="left"  >in seconds since the epoch; pass in an instance of the
                 <tt class="class">DateTime</tt> wrapper class</td></tr>
    <tr><td class="left"   valign="baseline"><tt class="constant">binary data</tt></td>
        <td class="left"  >pass in an instance of the <tt class="class">Binary</tt>
                       wrapper class</td></tr></tbody>
</table></div>

<P>
This is the full set of data types supported by XML-RPC.  Method calls
may also raise a special <tt class="exception">Fault</tt> instance, used to signal
XML-RPC server errors, or <tt class="exception">ProtocolError</tt> used to signal an
error in the HTTP/HTTPS transport layer.  Note that even though starting
with Python 2.2 you can subclass builtin types, the xmlrpclib module
currently does not marshal instances of such subclasses.

<P>
When passing strings, characters special to XML such as "<tt class="samp">&lt;</tt>",
"<tt class="samp">&gt;</tt>", and "<tt class="samp">&amp;</tt>" will be automatically escaped.  However, it's
the caller's responsibility to ensure that the string is free of
characters that aren't allowed in XML, such as the control characters
with ASCII values between 0 and 31; failing to do this will result in
an XML-RPC request that isn't well-formed XML.  If you have to pass
arbitrary strings via XML-RPC, use the <tt class="class">Binary</tt> wrapper class
described below.

<P>
<tt class="class">Server</tt> is retained as an alias for <tt class="class">ServerProxy</tt> for backwards
compatibility.  New code should use <tt class="class">ServerProxy</tt>.

<P>
</dl>

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <dl compact="compact" class="seetitle">
    <dt><em class="citetitle"><a href="http://xmlrpc-c.sourceforge.net/xmlrpc-howto/xmlrpc-howto.html"
        >XML-RPC HOWTO</a></em></dt>
    <dd>A good description of XML operation and
            client software in several languages.  Contains pretty much
            everything an XML-RPC client developer needs to know.</dd>
  </dl>
  <dl compact="compact" class="seetitle">
    <dt><em class="citetitle"><a href="http://xmlrpc-c.sourceforge.net/hacks.php"
        >XML-RPC-Hacks page</a></em></dt>
    <dd>Extensions for various open-source
            libraries to support introspection and multicall.</dd>
  </dl>
</div>

<P>

<p><br /></p><hr class='online-navigation' />
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<LI><A href="serverproxy-objects.html">11.22.1 ServerProxy Objects</a>
<LI><A href="boolean-objects.html">11.22.2 Boolean Objects</a>
<LI><A href="datetime-objects.html">11.22.3 DateTime Objects</a>
<LI><A href="binary-objects.html">11.22.4 Binary Objects</a>
<LI><A href="fault-objects.html">11.22.5 Fault Objects</a>
<LI><A href="protocol-error-objects.html">11.22.6 ProtocolError Objects</a>
<LI><A href="node559.html">11.22.7 MultiCall Objects</a>
<LI><A href="node560.html">11.22.8 Convenience Functions</a>
<LI><A href="xmlrpc-client-example.html">11.22.9 Example of Client Usage</a>
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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	54
	55	<H1><A NAME="SECTION00132200000000000000000">
	56	11.22 <tt class="module">xmlrpclib</tt> -- XML-RPC client access</A>
	57	</H1>
	58
	59	<P>
	60	<A NAME="module-xmlrpclib"></A>
	61
	62	<P>
	63
	64	<span class="versionnote">New in version 2.2.</span>
65
66	<P>
67	XML-RPC is a Remote Procedure Call method that uses XML passed via
68	HTTP as a transport. With it, a client can call methods with
69	parameters on a remote server (the server is named by a URI) and get back
70	structured data. This module supports writing XML-RPC client code; it
71	handles all the details of translating between conformable Python
72	objects and XML on the wire.
73
74	<P>
75	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
76	<td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3698' xml:id='l2h-3698' class="class">ServerProxy</tt></b>(</nobr></td>
77	<td><var>uri</var><big>[</big><var>, transport</var><big>[</big><var>,
78	encoding</var><big>[</big><var>, verbose</var><big>[</big><var>,
79	allow_none</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
80	<dd>
81	A <tt class="class">ServerProxy</tt> instance is an object that manages communication
82	with a remote XML-RPC server. The required first argument is a URI
83	(Uniform Resource Indicator), and will normally be the URL of the
84	server. The optional second argument is a transport factory instance;
85	by default it is an internal <tt class="class">SafeTransport</tt> instance for https:
86	URLs and an internal HTTP <tt class="class">Transport</tt> instance otherwise. The
87	optional third argument is an encoding, by default UTF-8. The optional
88	fourth argument is a debugging flag. If <var>allow_none</var> is true,
89	the Python constant <code>None</code> will be translated into XML; the
90	default behaviour is for <code>None</code> to raise a <tt class="exception">TypeError</tt>.
91	This is a commonly-used extension to the XML-RPC specification, but isn't
92	supported by all clients and servers; see
93	<a class="url" href="http://ontosys.com/xml-rpc/extensions.php">http://ontosys.com/xml-rpc/extensions.php</a> for a description.
94
95	<P>
96	Both the HTTP and HTTPS transports support the URL syntax extension for
97	HTTP Basic Authentication: <code>http://user:pass@host:port/path</code>. The
98	<code>user:pass</code> portion will be base64-encoded as an HTTP `Authorization'
99	header, and sent to the remote server as part of the connection process
100	when invoking an XML-RPC method. You only need to use this if the
101	remote server requires a Basic Authentication user and password.
102
103	<P>
104	The returned instance is a proxy object with methods that can be used
105	to invoke corresponding RPC calls on the remote server. If the remote
106	server supports the introspection API, the proxy can also be used to query
107	the remote server for the methods it supports (service discovery) and
108	fetch other server-associated metadata.
109
110	<P>
111	<tt class="class">ServerProxy</tt> instance methods take Python basic types and objects as
112	arguments and return Python basic types and classes. Types that are
113	conformable (e.g. that can be marshalled through XML), include the
114	following (and except where noted, they are unmarshalled as the same
115	Python type):
116
117	<P>
118	<div class="center"><table class="realtable">
119	<thead>
120	<tr>
121	<th class="left" >Name</th>
122	<th class="left" >Meaning</th>
123	</tr>
124	</thead>
125	<tbody>
126	<tr><td class="left" valign="baseline"><tt class="constant">boolean</tt></td>
127	<td class="left" >The <tt class="constant">True</tt> and <tt class="constant">False</tt> constants</td></tr>
128	<tr><td class="left" valign="baseline"><tt class="constant">integers</tt></td>
129	<td class="left" >Pass in directly</td></tr>
130	<tr><td class="left" valign="baseline"><tt class="constant">floating-point numbers</tt></td>
131	<td class="left" >Pass in directly</td></tr>
132	<tr><td class="left" valign="baseline"><tt class="constant">strings</tt></td>
133	<td class="left" >Pass in directly</td></tr>
134	<tr><td class="left" valign="baseline"><tt class="constant">arrays</tt></td>
135	<td class="left" >Any Python sequence type containing conformable
136	elements. Arrays are returned as lists</td></tr>
137	<tr><td class="left" valign="baseline"><tt class="constant">structures</tt></td>
138	<td class="left" >A Python dictionary. Keys must be strings,
139	values may be any conformable type.</td></tr>
140	<tr><td class="left" valign="baseline"><tt class="constant">dates</tt></td>
141	<td class="left" >in seconds since the epoch; pass in an instance of the
142	<tt class="class">DateTime</tt> wrapper class</td></tr>
143	<tr><td class="left" valign="baseline"><tt class="constant">binary data</tt></td>
144	<td class="left" >pass in an instance of the <tt class="class">Binary</tt>
145	wrapper class</td></tr></tbody>
146	</table></div>
147
148	<P>
149	This is the full set of data types supported by XML-RPC. Method calls
150	may also raise a special <tt class="exception">Fault</tt> instance, used to signal
151	XML-RPC server errors, or <tt class="exception">ProtocolError</tt> used to signal an
152	error in the HTTP/HTTPS transport layer. Note that even though starting
153	with Python 2.2 you can subclass builtin types, the xmlrpclib module
154	currently does not marshal instances of such subclasses.
155
156	<P>
157	When passing strings, characters special to XML such as "<tt class="samp"><</tt>",
158	"<tt class="samp">></tt>", and "<tt class="samp">&</tt>" will be automatically escaped. However, it's
159	the caller's responsibility to ensure that the string is free of
160	characters that aren't allowed in XML, such as the control characters
161	with ASCII values between 0 and 31; failing to do this will result in
162	an XML-RPC request that isn't well-formed XML. If you have to pass
163	arbitrary strings via XML-RPC, use the <tt class="class">Binary</tt> wrapper class
164	described below.
165
166	<P>
167	<tt class="class">Server</tt> is retained as an alias for <tt class="class">ServerProxy</tt> for backwards
168	compatibility. New code should use <tt class="class">ServerProxy</tt>.
169
170	<P>
171	</dl>
172
173	<P>
174	<div class="seealso">
175	<p class="heading">See Also:</p>
176
177	<dl compact="compact" class="seetitle">
178	<dt><em class="citetitle"><a href="http://xmlrpc-c.sourceforge.net/xmlrpc-howto/xmlrpc-howto.html"
179	>XML-RPC HOWTO</a></em></dt>
180	<dd>A good description of XML operation and
181	client software in several languages. Contains pretty much
182	everything an XML-RPC client developer needs to know.</dd>
183	</dl>
184	<dl compact="compact" class="seetitle">
185	<dt><em class="citetitle"><a href="http://xmlrpc-c.sourceforge.net/hacks.php"
186	>XML-RPC-Hacks page</a></em></dt>
187	<dd>Extensions for various open-source
188	libraries to support introspection and multicall.</dd>
189	</dl>
190	</div>
191
192	<P>
193
194	<p><br /></p><hr class='online-navigation' />
195	<div class='online-navigation'>
196	<!--Table of Child-Links-->
197	<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
198
199	<UL CLASS="ChildLinks">
200	<LI><A href="serverproxy-objects.html">11.22.1 ServerProxy Objects</a>
201	<LI><A href="boolean-objects.html">11.22.2 Boolean Objects</a>
202	<LI><A href="datetime-objects.html">11.22.3 DateTime Objects</a>
203	<LI><A href="binary-objects.html">11.22.4 Binary Objects</a>
204	<LI><A href="fault-objects.html">11.22.5 Fault Objects</a>
205	<LI><A href="protocol-error-objects.html">11.22.6 ProtocolError Objects</a>
206	<LI><A href="node559.html">11.22.7 MultiCall Objects</a>
207	<LI><A href="node560.html">11.22.8 Convenience Functions</a>
208	<LI><A href="xmlrpc-client-example.html">11.22.9 Example of Client Usage</a>
209	</ul>
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247	<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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