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| 54 | |
| 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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