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<H2><A NAME="SECTION0013530000000000000000"></A><A NAME="base-handler-objects"></A>
<BR>
11.5.3 BaseHandler Objects 
</H2>

<P>
<tt class="class">BaseHandler</tt> objects provide a couple of methods that are
directly useful, and others that are meant to be used by derived
classes.  These are intended for direct use:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3264' xml:id='l2h-3264' class="method">add_parent</tt></b>(</nobr></td>
  <td><var>director</var>)</td></tr></table></dt>
<dd>
Add a director as parent.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3265' xml:id='l2h-3265' class="method">close</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Remove any parents.
</dl>

<P>
The following members and methods should only be used by classes
derived from <tt class="class">BaseHandler</tt>.  <span class="note"><b class="label">Note:</b>
The convention has been
adopted that subclasses defining <tt class="method"><var>protocol</var>_request()</tt> or
<tt class="method"><var>protocol</var>_response()</tt> methods are named
<tt class="class">*Processor</tt>; all others are named <tt class="class">*Handler</tt>.</span>

<P>
<dl><dt><b><tt id='l2h-3266' xml:id='l2h-3266' class="member">parent</tt></b></dt>
<dd>
A valid <tt class="class">OpenerDirector</tt>, which can be used to open using a
different protocol, or handle errors.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3267' xml:id='l2h-3267' class="method">default_open</tt></b>(</nobr></td>
  <td><var>req</var>)</td></tr></table></dt>
<dd>
This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
subclasses should define it if they want to catch all URLs.

<P>
This method, if implemented, will be called by the parent
<tt class="class">OpenerDirector</tt>.  It should return a file-like object as
described in the return value of the <tt class="method">open()</tt> of
<tt class="class">OpenerDirector</tt>, or <code>None</code>.  It should raise
<tt class="exception">URLError</tt>, unless a truly exceptional thing happens (for
example, <tt class="exception">MemoryError</tt> should not be mapped to
<tt class="exception">URLError</tt>).

<P>
This method will be called before any protocol-specific open method.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><var>protocol</var>_open</b>(</nobr></td>
  <td><var>req</var>)</td></tr></table></dt>
<dd>
This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
subclasses should define it if they want to handle URLs with the given
protocol.

<P>
This method, if defined, will be called by the parent
<tt class="class">OpenerDirector</tt>.  Return values should be the same as for 
<tt class="method">default_open()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3268' xml:id='l2h-3268' class="method">unknown_open</tt></b>(</nobr></td>
  <td><var>req</var>)</td></tr></table></dt>
<dd>
This method is <var>not</var> defined in <tt class="class">BaseHandler</tt>, but
subclasses should define it if they want to catch all URLs with no
specific registered handler to open it.

<P>
This method, if implemented, will be called by the <tt class="member">parent</tt> 
<tt class="class">OpenerDirector</tt>.  Return values should be the same as for 
<tt class="method">default_open()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3269' xml:id='l2h-3269' class="method">http_error_default</tt></b>(</nobr></td>
  <td><var>req, fp, code, msg, hdrs</var>)</td></tr></table></dt>
<dd>
This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
subclasses should override it if they intend to provide a catch-all
for otherwise unhandled HTTP errors.  It will be called automatically
by the  <tt class="class">OpenerDirector</tt> getting the error, and should not
normally be called in other circumstances.

<P>
<var>req</var> will be a <tt class="class">Request</tt> object, <var>fp</var> will be a
file-like object with the HTTP error body, <var>code</var> will be the
three-digit code of the error, <var>msg</var> will be the user-visible
explanation of the code and <var>hdrs</var> will be a mapping object with
the headers of the error.

<P>
Return values and exceptions raised should be the same as those
of <tt class="function">urlopen()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3270' xml:id='l2h-3270' class="method">http_error_<var>nnn</var></tt></b>(</nobr></td>
  <td><var>req, fp, code, msg, hdrs</var>)</td></tr></table></dt>
<dd>
<var>nnn</var> should be a three-digit HTTP error code.  This method is
also not defined in <tt class="class">BaseHandler</tt>, but will be called, if it
exists, on an instance of a subclass, when an HTTP error with code
<var>nnn</var> occurs.

<P>
Subclasses should override this method to handle specific HTTP
errors.

<P>
Arguments, return values and exceptions raised should be the same as
for <tt class="method">http_error_default()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><var>protocol</var>_request</b>(</nobr></td>
  <td><var>req</var>)</td></tr></table></dt>
<dd>
This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
subclasses should define it if they want to pre-process requests of
the given protocol.

<P>
This method, if defined, will be called by the parent
<tt class="class">OpenerDirector</tt>.  <var>req</var> will be a <tt class="class">Request</tt> object.
The return value should be a <tt class="class">Request</tt> object.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><var>protocol</var>_response</b>(</nobr></td>
  <td><var>req, response</var>)</td></tr></table></dt>
<dd>
This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
subclasses should define it if they want to post-process responses of
the given protocol.

<P>
This method, if defined, will be called by the parent
<tt class="class">OpenerDirector</tt>.  <var>req</var> will be a <tt class="class">Request</tt> object.
<var>response</var> will be an object implementing the same interface as
the return value of <tt class="function">urlopen()</tt>.  The return value should
implement the same interface as the return value of
<tt class="function">urlopen()</tt>.
</dl>

<P>

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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	<H2><A NAME="SECTION0013530000000000000000"></A><A NAME="base-handler-objects"></A>
	56	<BR>
	57	11.5.3 BaseHandler Objects
	58	</H2>
	59
	60	<P>
	61	<tt class="class">BaseHandler</tt> objects provide a couple of methods that are
	62	directly useful, and others that are meant to be used by derived
	63	classes. These are intended for direct use:
	64
65	<P>
66	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
67	<td><nobr><b><tt id='l2h-3264' xml:id='l2h-3264' class="method">add_parent</tt></b>(</nobr></td>
68	<td><var>director</var>)</td></tr></table></dt>
69	<dd>
70	Add a director as parent.
71	</dl>
72
73	<P>
74	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
75	<td><nobr><b><tt id='l2h-3265' xml:id='l2h-3265' class="method">close</tt></b>(</nobr></td>
76	<td><var></var>)</td></tr></table></dt>
77	<dd>
78	Remove any parents.
79	</dl>
80
81	<P>
82	The following members and methods should only be used by classes
83	derived from <tt class="class">BaseHandler</tt>. <span class="note"><b class="label">Note:</b>
84	The convention has been
85	adopted that subclasses defining <tt class="method"><var>protocol</var>_request()</tt> or
86	<tt class="method"><var>protocol</var>_response()</tt> methods are named
87	<tt class="class">Processor</tt>; all others are named <tt class="class">Handler</tt>.</span>
88
89	<P>
90	<dl><dt><b><tt id='l2h-3266' xml:id='l2h-3266' class="member">parent</tt></b></dt>
91	<dd>
92	A valid <tt class="class">OpenerDirector</tt>, which can be used to open using a
93	different protocol, or handle errors.
94	</dl>
95
96	<P>
97	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
98	<td><nobr><b><tt id='l2h-3267' xml:id='l2h-3267' class="method">default_open</tt></b>(</nobr></td>
99	<td><var>req</var>)</td></tr></table></dt>
100	<dd>
101	This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
102	subclasses should define it if they want to catch all URLs.
103
104	<P>
105	This method, if implemented, will be called by the parent
106	<tt class="class">OpenerDirector</tt>. It should return a file-like object as
107	described in the return value of the <tt class="method">open()</tt> of
108	<tt class="class">OpenerDirector</tt>, or <code>None</code>. It should raise
109	<tt class="exception">URLError</tt>, unless a truly exceptional thing happens (for
110	example, <tt class="exception">MemoryError</tt> should not be mapped to
111	<tt class="exception">URLError</tt>).
112
113	<P>
114	This method will be called before any protocol-specific open method.
115	</dl>
116
117	<P>
118	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
119	<td><nobr><b><var>protocol</var>_open</b>(</nobr></td>
120	<td><var>req</var>)</td></tr></table></dt>
121	<dd>
122	This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
123	subclasses should define it if they want to handle URLs with the given
124	protocol.
125
126	<P>
127	This method, if defined, will be called by the parent
128	<tt class="class">OpenerDirector</tt>. Return values should be the same as for
129	<tt class="method">default_open()</tt>.
130	</dl>
131
132	<P>
133	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
134	<td><nobr><b><tt id='l2h-3268' xml:id='l2h-3268' class="method">unknown_open</tt></b>(</nobr></td>
135	<td><var>req</var>)</td></tr></table></dt>
136	<dd>
137	This method is <var>not</var> defined in <tt class="class">BaseHandler</tt>, but
138	subclasses should define it if they want to catch all URLs with no
139	specific registered handler to open it.
140
141	<P>
142	This method, if implemented, will be called by the <tt class="member">parent</tt>
143	<tt class="class">OpenerDirector</tt>. Return values should be the same as for
144	<tt class="method">default_open()</tt>.
145	</dl>
146
147	<P>
148	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
149	<td><nobr><b><tt id='l2h-3269' xml:id='l2h-3269' class="method">http_error_default</tt></b>(</nobr></td>
150	<td><var>req, fp, code, msg, hdrs</var>)</td></tr></table></dt>
151	<dd>
152	This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
153	subclasses should override it if they intend to provide a catch-all
154	for otherwise unhandled HTTP errors. It will be called automatically
155	by the <tt class="class">OpenerDirector</tt> getting the error, and should not
156	normally be called in other circumstances.
157
158	<P>
159	<var>req</var> will be a <tt class="class">Request</tt> object, <var>fp</var> will be a
160	file-like object with the HTTP error body, <var>code</var> will be the
161	three-digit code of the error, <var>msg</var> will be the user-visible
162	explanation of the code and <var>hdrs</var> will be a mapping object with
163	the headers of the error.
164
165	<P>
166	Return values and exceptions raised should be the same as those
167	of <tt class="function">urlopen()</tt>.
168	</dl>
169
170	<P>
171	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
172	<td><nobr><b><tt id='l2h-3270' xml:id='l2h-3270' class="method">http_error_<var>nnn</var></tt></b>(</nobr></td>
173	<td><var>req, fp, code, msg, hdrs</var>)</td></tr></table></dt>
174	<dd>
175	<var>nnn</var> should be a three-digit HTTP error code. This method is
176	also not defined in <tt class="class">BaseHandler</tt>, but will be called, if it
177	exists, on an instance of a subclass, when an HTTP error with code
178	<var>nnn</var> occurs.
179
180	<P>
181	Subclasses should override this method to handle specific HTTP
182	errors.
183
184	<P>
185	Arguments, return values and exceptions raised should be the same as
186	for <tt class="method">http_error_default()</tt>.
187	</dl>
188
189	<P>
190	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
191	<td><nobr><b><var>protocol</var>_request</b>(</nobr></td>
192	<td><var>req</var>)</td></tr></table></dt>
193	<dd>
194	This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
195	subclasses should define it if they want to pre-process requests of
196	the given protocol.
197
198	<P>
199	This method, if defined, will be called by the parent
200	<tt class="class">OpenerDirector</tt>. <var>req</var> will be a <tt class="class">Request</tt> object.
201	The return value should be a <tt class="class">Request</tt> object.
202	</dl>
203
204	<P>
205	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
206	<td><nobr><b><var>protocol</var>_response</b>(</nobr></td>
207	<td><var>req, response</var>)</td></tr></table></dt>
208	<dd>
209	This method is <em>not</em> defined in <tt class="class">BaseHandler</tt>, but
210	subclasses should define it if they want to post-process responses of
211	the given protocol.
212
213	<P>
214	This method, if defined, will be called by the parent
215	<tt class="class">OpenerDirector</tt>. <var>req</var> will be a <tt class="class">Request</tt> object.
216	<var>response</var> will be an object implementing the same interface as
217	the return value of <tt class="function">urlopen()</tt>. The return value should
218	implement the same interface as the return value of
219	<tt class="function">urlopen()</tt>.
220	</dl>
221
222	<P>
223
224	<DIV CLASS="navigation">
225	<div class='online-navigation'>
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