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55 | <H1><A NAME="SECTION00131700000000000000000"> | |
56 | 11.17 <tt class="module">BaseHTTPServer</tt> -- | |
57 | Basic HTTP server</A> | |
58 | </H1> | |
59 | ||
60 | <P> | |
61 | <A NAME="module-BaseHTTPServer"></A> | |
62 | ||
63 | <P> | |
64 | <a id='l2h-3569' xml:id='l2h-3569'></a><a id='l2h-3570' xml:id='l2h-3570'></a><a id='l2h-3601' xml:id='l2h-3601'></a> | |
65 | ||
66 | <P> | |
67 | This module defines two classes for implementing HTTP servers | |
68 | (Web servers). Usually, this module isn't used directly, but is used | |
69 | as a basis for building functioning Web servers. See the | |
70 | <tt class="module"><a href="module-SimpleHTTPServer.html">SimpleHTTPServer</a></tt><a id='l2h-3602' xml:id='l2h-3602'></a> and | |
71 | <tt class="module"><a href="module-CGIHTTPServer.html">CGIHTTPServer</a></tt><a id='l2h-3603' xml:id='l2h-3603'></a> modules. | |
72 | ||
73 | <P> | |
74 | The first class, <tt class="class">HTTPServer</tt>, is a | |
75 | <tt class="class">SocketServer.TCPServer</tt> subclass. It creates and listens at the | |
76 | HTTP socket, dispatching the requests to a handler. Code to create and | |
77 | run the server looks like this: | |
78 | ||
79 | <P> | |
80 | <div class="verbatim"><pre> | |
81 | def run(server_class=BaseHTTPServer.HTTPServer, | |
82 | handler_class=BaseHTTPServer.BaseHTTPRequestHandler): | |
83 | server_address = ('', 8000) | |
84 | httpd = server_class(server_address, handler_class) | |
85 | httpd.serve_forever() | |
86 | </pre></div> | |
87 | ||
88 | <P> | |
89 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
90 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3571' xml:id='l2h-3571' class="class">HTTPServer</tt></b>(</nobr></td> | |
91 | <td><var>server_address, RequestHandlerClass</var>)</td></tr></table></dt> | |
92 | <dd> | |
93 | This class builds on the <tt class="class">TCPServer</tt> class by | |
94 | storing the server address as instance | |
95 | variables named <tt class="member">server_name</tt> and <tt class="member">server_port</tt>. The | |
96 | server is accessible by the handler, typically through the handler's | |
97 | <tt class="member">server</tt> instance variable. | |
98 | </dl> | |
99 | ||
100 | <P> | |
101 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
102 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3572' xml:id='l2h-3572' class="class">BaseHTTPRequestHandler</tt></b>(</nobr></td> | |
103 | <td><var>request, client_address, server</var>)</td></tr></table></dt> | |
104 | <dd> | |
105 | This class is used | |
106 | to handle the HTTP requests that arrive at the server. By itself, | |
107 | it cannot respond to any actual HTTP requests; it must be subclassed | |
108 | to handle each request method (e.g. GET or POST). | |
109 | <tt class="class">BaseHTTPRequestHandler</tt> provides a number of class and instance | |
110 | variables, and methods for use by subclasses. | |
111 | ||
112 | <P> | |
113 | The handler will parse the request and the headers, then call a | |
114 | method specific to the request type. The method name is constructed | |
115 | from the request. For example, for the request method "<tt class="samp">SPAM</tt>", the | |
116 | <tt class="method">do_SPAM()</tt> method will be called with no arguments. All of | |
117 | the relevant information is stored in instance variables of the | |
118 | handler. Subclasses should not need to override or extend the | |
119 | <tt class="method">__init__()</tt> method. | |
120 | </dl> | |
121 | ||
122 | <P> | |
123 | <tt class="class">BaseHTTPRequestHandler</tt> has the following instance variables: | |
124 | ||
125 | <P> | |
126 | <dl><dt><b><tt id='l2h-3573' xml:id='l2h-3573' class="member">client_address</tt></b></dt> | |
127 | <dd> | |
128 | Contains a tuple of the form <code>(<var>host</var>, <var>port</var>)</code> referring | |
129 | to the client's address. | |
130 | </dl> | |
131 | ||
132 | <P> | |
133 | <dl><dt><b><tt id='l2h-3574' xml:id='l2h-3574' class="member">command</tt></b></dt> | |
134 | <dd> | |
135 | Contains the command (request type). For example, <code>'GET'</code>. | |
136 | </dl> | |
137 | ||
138 | <P> | |
139 | <dl><dt><b><tt id='l2h-3575' xml:id='l2h-3575' class="member">path</tt></b></dt> | |
140 | <dd> | |
141 | Contains the request path. | |
142 | </dl> | |
143 | ||
144 | <P> | |
145 | <dl><dt><b><tt id='l2h-3576' xml:id='l2h-3576' class="member">request_version</tt></b></dt> | |
146 | <dd> | |
147 | Contains the version string from the request. For example, | |
148 | <code>'HTTP/1.0'</code>. | |
149 | </dl> | |
150 | ||
151 | <P> | |
152 | <dl><dt><b><tt id='l2h-3577' xml:id='l2h-3577' class="member">headers</tt></b></dt> | |
153 | <dd> | |
154 | Holds an instance of the class specified by the <tt class="member">MessageClass</tt> | |
155 | class variable. This instance parses and manages the headers in | |
156 | the HTTP request. | |
157 | </dl> | |
158 | ||
159 | <P> | |
160 | <dl><dt><b><tt id='l2h-3578' xml:id='l2h-3578' class="member">rfile</tt></b></dt> | |
161 | <dd> | |
162 | Contains an input stream, positioned at the start of the optional | |
163 | input data. | |
164 | </dl> | |
165 | ||
166 | <P> | |
167 | <dl><dt><b><tt id='l2h-3579' xml:id='l2h-3579' class="member">wfile</tt></b></dt> | |
168 | <dd> | |
169 | Contains the output stream for writing a response back to the client. | |
170 | Proper adherence to the HTTP protocol must be used when writing | |
171 | to this stream. | |
172 | </dl> | |
173 | ||
174 | <P> | |
175 | <tt class="class">BaseHTTPRequestHandler</tt> has the following class variables: | |
176 | ||
177 | <P> | |
178 | <dl><dt><b><tt id='l2h-3580' xml:id='l2h-3580' class="member">server_version</tt></b></dt> | |
179 | <dd> | |
180 | Specifies the server software version. You may want to override | |
181 | this. | |
182 | The format is multiple whitespace-separated strings, | |
183 | where each string is of the form name[/version]. | |
184 | For example, <code>'BaseHTTP/0.2'</code>. | |
185 | </dl> | |
186 | ||
187 | <P> | |
188 | <dl><dt><b><tt id='l2h-3581' xml:id='l2h-3581' class="member">sys_version</tt></b></dt> | |
189 | <dd> | |
190 | Contains the Python system version, in a form usable by the | |
191 | <tt class="member">version_string</tt> method and the <tt class="member">server_version</tt> class | |
192 | variable. For example, <code>'Python/1.4'</code>. | |
193 | </dl> | |
194 | ||
195 | <P> | |
196 | <dl><dt><b><tt id='l2h-3582' xml:id='l2h-3582' class="member">error_message_format</tt></b></dt> | |
197 | <dd> | |
198 | Specifies a format string for building an error response to the | |
199 | client. It uses parenthesized, keyed format specifiers, so the | |
200 | format operand must be a dictionary. The <var>code</var> key should | |
201 | be an integer, specifying the numeric HTTP error code value. | |
202 | <var>message</var> should be a string containing a (detailed) error | |
203 | message of what occurred, and <var>explain</var> should be an | |
204 | explanation of the error code number. Default <var>message</var> | |
205 | and <var>explain</var> values can found in the <var>responses</var> | |
206 | class variable. | |
207 | </dl> | |
208 | ||
209 | <P> | |
210 | <dl><dt><b><tt id='l2h-3583' xml:id='l2h-3583' class="member">protocol_version</tt></b></dt> | |
211 | <dd> | |
212 | This specifies the HTTP protocol version used in responses. If set | |
213 | to <code>'HTTP/1.1'</code>, the server will permit HTTP persistent | |
214 | connections; however, your server <em>must</em> then include an | |
215 | accurate <code>Content-Length</code> header (using <tt class="method">send_header()</tt>) | |
216 | in all of its responses to clients. For backwards compatibility, | |
217 | the setting defaults to <code>'HTTP/1.0'</code>. | |
218 | </dl> | |
219 | ||
220 | <P> | |
221 | <dl><dt><b><tt id='l2h-3584' xml:id='l2h-3584' class="member">MessageClass</tt></b></dt> | |
222 | <dd> | |
223 | Specifies a <tt class="class">rfc822.Message</tt>-like class to parse HTTP | |
224 | headers. Typically, this is not overridden, and it defaults to | |
225 | <tt class="class">mimetools.Message</tt>. | |
226 | <a id='l2h-3586' xml:id='l2h-3586'></a></dl> | |
227 | ||
228 | <P> | |
229 | <dl><dt><b><tt id='l2h-3587' xml:id='l2h-3587' class="member">responses</tt></b></dt> | |
230 | <dd> | |
231 | This variable contains a mapping of error code integers to two-element | |
232 | tuples containing a short and long message. For example, | |
233 | <code>{<var>code</var>: (<var>shortmessage</var>, <var>longmessage</var>)}</code>. The | |
234 | <var>shortmessage</var> is usually used as the <var>message</var> key in an | |
235 | error response, and <var>longmessage</var> as the <var>explain</var> key | |
236 | (see the <tt class="member">error_message_format</tt> class variable). | |
237 | </dl> | |
238 | ||
239 | <P> | |
240 | A <tt class="class">BaseHTTPRequestHandler</tt> instance has the following methods: | |
241 | ||
242 | <P> | |
243 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
244 | <td><nobr><b><tt id='l2h-3588' xml:id='l2h-3588' class="method">handle</tt></b>(</nobr></td> | |
245 | <td><var></var>)</td></tr></table></dt> | |
246 | <dd> | |
247 | Calls <tt class="method">handle_one_request()</tt> once (or, if persistent connections | |
248 | are enabled, multiple times) to handle incoming HTTP requests. | |
249 | You should never need to override it; instead, implement appropriate | |
250 | <tt class="method">do_*()</tt> methods. | |
251 | </dl> | |
252 | ||
253 | <P> | |
254 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
255 | <td><nobr><b><tt id='l2h-3589' xml:id='l2h-3589' class="method">handle_one_request</tt></b>(</nobr></td> | |
256 | <td><var></var>)</td></tr></table></dt> | |
257 | <dd> | |
258 | This method will parse and dispatch | |
259 | the request to the appropriate <tt class="method">do_*()</tt> method. You should | |
260 | never need to override it. | |
261 | </dl> | |
262 | ||
263 | <P> | |
264 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
265 | <td><nobr><b><tt id='l2h-3590' xml:id='l2h-3590' class="method">send_error</tt></b>(</nobr></td> | |
266 | <td><var>code</var><big>[</big><var>, message</var><big>]</big><var></var>)</td></tr></table></dt> | |
267 | <dd> | |
268 | Sends and logs a complete error reply to the client. The numeric | |
269 | <var>code</var> specifies the HTTP error code, with <var>message</var> as | |
270 | optional, more specific text. A complete set of headers is sent, | |
271 | followed by text composed using the <tt class="member">error_message_format</tt> | |
272 | class variable. | |
273 | </dl> | |
274 | ||
275 | <P> | |
276 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
277 | <td><nobr><b><tt id='l2h-3591' xml:id='l2h-3591' class="method">send_response</tt></b>(</nobr></td> | |
278 | <td><var>code</var><big>[</big><var>, message</var><big>]</big><var></var>)</td></tr></table></dt> | |
279 | <dd> | |
280 | Sends a response header and logs the accepted request. The HTTP | |
281 | response line is sent, followed by <em>Server</em> and <em>Date</em> | |
282 | headers. The values for these two headers are picked up from the | |
283 | <tt class="method">version_string()</tt> and <tt class="method">date_time_string()</tt> methods, | |
284 | respectively. | |
285 | </dl> | |
286 | ||
287 | <P> | |
288 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
289 | <td><nobr><b><tt id='l2h-3592' xml:id='l2h-3592' class="method">send_header</tt></b>(</nobr></td> | |
290 | <td><var>keyword, value</var>)</td></tr></table></dt> | |
291 | <dd> | |
292 | Writes a specific HTTP header to the output stream. <var>keyword</var> | |
293 | should specify the header keyword, with <var>value</var> specifying | |
294 | its value. | |
295 | </dl> | |
296 | ||
297 | <P> | |
298 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
299 | <td><nobr><b><tt id='l2h-3593' xml:id='l2h-3593' class="method">end_headers</tt></b>(</nobr></td> | |
300 | <td><var></var>)</td></tr></table></dt> | |
301 | <dd> | |
302 | Sends a blank line, indicating the end of the HTTP headers in | |
303 | the response. | |
304 | </dl> | |
305 | ||
306 | <P> | |
307 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
308 | <td><nobr><b><tt id='l2h-3594' xml:id='l2h-3594' class="method">log_request</tt></b>(</nobr></td> | |
309 | <td><var></var><big>[</big><var>code</var><big>[</big><var>, size</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> | |
310 | <dd> | |
311 | Logs an accepted (successful) request. <var>code</var> should specify | |
312 | the numeric HTTP code associated with the response. If a size of | |
313 | the response is available, then it should be passed as the | |
314 | <var>size</var> parameter. | |
315 | </dl> | |
316 | ||
317 | <P> | |
318 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
319 | <td><nobr><b><tt id='l2h-3595' xml:id='l2h-3595' class="method">log_error</tt></b>(</nobr></td> | |
320 | <td><var>...</var>)</td></tr></table></dt> | |
321 | <dd> | |
322 | Logs an error when a request cannot be fulfilled. By default, | |
323 | it passes the message to <tt class="method">log_message()</tt>, so it takes the | |
324 | same arguments (<var>format</var> and additional values). | |
325 | </dl> | |
326 | ||
327 | <P> | |
328 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
329 | <td><nobr><b><tt id='l2h-3596' xml:id='l2h-3596' class="method">log_message</tt></b>(</nobr></td> | |
330 | <td><var>format, ...</var>)</td></tr></table></dt> | |
331 | <dd> | |
332 | Logs an arbitrary message to <code>sys.stderr</code>. This is typically | |
333 | overridden to create custom error logging mechanisms. The | |
334 | <var>format</var> argument is a standard printf-style format string, | |
335 | where the additional arguments to <tt class="method">log_message()</tt> are applied | |
336 | as inputs to the formatting. The client address and current date | |
337 | and time are prefixed to every message logged. | |
338 | </dl> | |
339 | ||
340 | <P> | |
341 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
342 | <td><nobr><b><tt id='l2h-3597' xml:id='l2h-3597' class="method">version_string</tt></b>(</nobr></td> | |
343 | <td><var></var>)</td></tr></table></dt> | |
344 | <dd> | |
345 | Returns the server software's version string. This is a combination | |
346 | of the <tt class="member">server_version</tt> and <tt class="member">sys_version</tt> class variables. | |
347 | </dl> | |
348 | ||
349 | <P> | |
350 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
351 | <td><nobr><b><tt id='l2h-3598' xml:id='l2h-3598' class="method">date_time_string</tt></b>(</nobr></td> | |
352 | <td><var></var>)</td></tr></table></dt> | |
353 | <dd> | |
354 | Returns the current date and time, formatted for a message header. | |
355 | </dl> | |
356 | ||
357 | <P> | |
358 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
359 | <td><nobr><b><tt id='l2h-3599' xml:id='l2h-3599' class="method">log_data_time_string</tt></b>(</nobr></td> | |
360 | <td><var></var>)</td></tr></table></dt> | |
361 | <dd> | |
362 | Returns the current date and time, formatted for logging. | |
363 | </dl> | |
364 | ||
365 | <P> | |
366 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
367 | <td><nobr><b><tt id='l2h-3600' xml:id='l2h-3600' class="method">address_string</tt></b>(</nobr></td> | |
368 | <td><var></var>)</td></tr></table></dt> | |
369 | <dd> | |
370 | Returns the client address, formatted for logging. A name lookup | |
371 | is performed on the client's IP address. | |
372 | </dl> | |
373 | ||
374 | <P> | |
375 | <div class="seealso"> | |
376 | <p class="heading">See Also:</p> | |
377 | ||
378 | <dl compact="compact" class="seemodule"> | |
379 | <dt>Module <b><tt class="module"><a href="module-CGIHTTPServer.html">CGIHTTPServer</a></tt>:</b> | |
380 | <dd>Extended request handler that supports CGI | |
381 | scripts. | |
382 | </dl> | |
383 | ||
384 | <P> | |
385 | <dl compact="compact" class="seemodule"> | |
386 | <dt>Module <b><tt class="module"><a href="module-SimpleHTTPServer.html">SimpleHTTPServer</a></tt>:</b> | |
387 | <dd>Basic request handler that limits response | |
388 | to files actually under the document root. | |
389 | </dl> | |
390 | </div> | |
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426 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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