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Move the 3k reST doc tree in place.
author Georg Brandl <georg@python.org>
date Wed, 15 Aug 2007 14:28:22 +0000
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children 808f32a0d99c 734fc0a19657
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2 :mod:`BaseHTTPServer` --- Basic HTTP server
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3 ===========================================
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4
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5 .. module:: BaseHTTPServer
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6 :synopsis: Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer).
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9 .. index::
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10 pair: WWW; server
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11 pair: HTTP; protocol
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12 single: URL
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13 single: httpd
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15 .. index::
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16 module: SimpleHTTPServer
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17 module: CGIHTTPServer
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18
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19 This module defines two classes for implementing HTTP servers (Web servers).
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20 Usually, this module isn't used directly, but is used as a basis for building
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21 functioning Web servers. See the :mod:`SimpleHTTPServer` and
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22 :mod:`CGIHTTPServer` modules.
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23
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24 The first class, :class:`HTTPServer`, is a :class:`SocketServer.TCPServer`
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25 subclass. It creates and listens at the HTTP socket, dispatching the requests
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26 to a handler. Code to create and run the server looks like this::
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28 def run(server_class=BaseHTTPServer.HTTPServer,
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29 handler_class=BaseHTTPServer.BaseHTTPRequestHandler):
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30 server_address = ('', 8000)
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31 httpd = server_class(server_address, handler_class)
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32 httpd.serve_forever()
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35 .. class:: HTTPServer(server_address, RequestHandlerClass)
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36
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37 This class builds on the :class:`TCPServer` class by storing the server address
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38 as instance variables named :attr:`server_name` and :attr:`server_port`. The
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39 server is accessible by the handler, typically through the handler's
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40 :attr:`server` instance variable.
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43 .. class:: BaseHTTPRequestHandler(request, client_address, server)
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44
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45 This class is used to handle the HTTP requests that arrive at the server. By
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46 itself, it cannot respond to any actual HTTP requests; it must be subclassed to
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47 handle each request method (e.g. GET or POST). :class:`BaseHTTPRequestHandler`
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48 provides a number of class and instance variables, and methods for use by
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49 subclasses.
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50
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51 The handler will parse the request and the headers, then call a method specific
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52 to the request type. The method name is constructed from the request. For
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53 example, for the request method ``SPAM``, the :meth:`do_SPAM` method will be
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54 called with no arguments. All of the relevant information is stored in instance
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55 variables of the handler. Subclasses should not need to override or extend the
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56 :meth:`__init__` method.
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57
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58 :class:`BaseHTTPRequestHandler` has the following instance variables:
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61 .. attribute:: BaseHTTPRequestHandler.client_address
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62
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63 Contains a tuple of the form ``(host, port)`` referring to the client's address.
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64
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65
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66 .. attribute:: BaseHTTPRequestHandler.command
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67
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68 Contains the command (request type). For example, ``'GET'``.
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69
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71 .. attribute:: BaseHTTPRequestHandler.path
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72
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73 Contains the request path.
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75
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76 .. attribute:: BaseHTTPRequestHandler.request_version
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77
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78 Contains the version string from the request. For example, ``'HTTP/1.0'``.
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81 .. attribute:: BaseHTTPRequestHandler.headers
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82
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83 Holds an instance of the class specified by the :attr:`MessageClass` class
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84 variable. This instance parses and manages the headers in the HTTP request.
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85
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86
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87 .. attribute:: BaseHTTPRequestHandler.rfile
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88
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89 Contains an input stream, positioned at the start of the optional input data.
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90
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91
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92 .. attribute:: BaseHTTPRequestHandler.wfile
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93
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94 Contains the output stream for writing a response back to the client. Proper
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95 adherence to the HTTP protocol must be used when writing to this stream.
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96
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97 :class:`BaseHTTPRequestHandler` has the following class variables:
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98
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99
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100 .. attribute:: BaseHTTPRequestHandler.server_version
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101
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102 Specifies the server software version. You may want to override this. The
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103 format is multiple whitespace-separated strings, where each string is of the
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104 form name[/version]. For example, ``'BaseHTTP/0.2'``.
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105
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106
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107 .. attribute:: BaseHTTPRequestHandler.sys_version
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108
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109 Contains the Python system version, in a form usable by the
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110 :attr:`version_string` method and the :attr:`server_version` class variable. For
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111 example, ``'Python/1.4'``.
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112
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113
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114 .. attribute:: BaseHTTPRequestHandler.error_message_format
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115
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116 Specifies a format string for building an error response to the client. It uses
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117 parenthesized, keyed format specifiers, so the format operand must be a
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118 dictionary. The *code* key should be an integer, specifying the numeric HTTP
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119 error code value. *message* should be a string containing a (detailed) error
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120 message of what occurred, and *explain* should be an explanation of the error
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121 code number. Default *message* and *explain* values can found in the *responses*
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122 class variable.
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123
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124
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125 .. attribute:: BaseHTTPRequestHandler.protocol_version
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126
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127 This specifies the HTTP protocol version used in responses. If set to
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128 ``'HTTP/1.1'``, the server will permit HTTP persistent connections; however,
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129 your server *must* then include an accurate ``Content-Length`` header (using
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130 :meth:`send_header`) in all of its responses to clients. For backwards
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131 compatibility, the setting defaults to ``'HTTP/1.0'``.
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132
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133
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134 .. attribute:: BaseHTTPRequestHandler.MessageClass
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135
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136 .. index:: single: Message (in module mimetools)
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137
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138 Specifies a :class:`rfc822.Message`\ -like class to parse HTTP headers.
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139 Typically, this is not overridden, and it defaults to
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140 :class:`mimetools.Message`.
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141
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142
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143 .. attribute:: BaseHTTPRequestHandler.responses
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144
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145 This variable contains a mapping of error code integers to two-element tuples
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146 containing a short and long message. For example, ``{code: (shortmessage,
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147 longmessage)}``. The *shortmessage* is usually used as the *message* key in an
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148 error response, and *longmessage* as the *explain* key (see the
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149 :attr:`error_message_format` class variable).
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150
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151 A :class:`BaseHTTPRequestHandler` instance has the following methods:
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152
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153
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154 .. method:: BaseHTTPRequestHandler.handle()
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155
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156 Calls :meth:`handle_one_request` once (or, if persistent connections are
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157 enabled, multiple times) to handle incoming HTTP requests. You should never need
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158 to override it; instead, implement appropriate :meth:`do_\*` methods.
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159
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160
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161 .. method:: BaseHTTPRequestHandler.handle_one_request()
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162
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163 This method will parse and dispatch the request to the appropriate :meth:`do_\*`
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164 method. You should never need to override it.
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165
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166
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167 .. method:: BaseHTTPRequestHandler.send_error(code[, message])
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168
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169 Sends and logs a complete error reply to the client. The numeric *code*
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170 specifies the HTTP error code, with *message* as optional, more specific text. A
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171 complete set of headers is sent, followed by text composed using the
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172 :attr:`error_message_format` class variable.
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173
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174
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175 .. method:: BaseHTTPRequestHandler.send_response(code[, message])
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176
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177 Sends a response header and logs the accepted request. The HTTP response line is
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178 sent, followed by *Server* and *Date* headers. The values for these two headers
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179 are picked up from the :meth:`version_string` and :meth:`date_time_string`
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180 methods, respectively.
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181
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182
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183 .. method:: BaseHTTPRequestHandler.send_header(keyword, value)
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184
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185 Writes a specific HTTP header to the output stream. *keyword* should specify the
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186 header keyword, with *value* specifying its value.
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187
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188
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189 .. method:: BaseHTTPRequestHandler.end_headers()
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190
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191 Sends a blank line, indicating the end of the HTTP headers in the response.
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192
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193
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194 .. method:: BaseHTTPRequestHandler.log_request([code[, size]])
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195
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196 Logs an accepted (successful) request. *code* should specify the numeric HTTP
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197 code associated with the response. If a size of the response is available, then
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198 it should be passed as the *size* parameter.
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199
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200
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201 .. method:: BaseHTTPRequestHandler.log_error(...)
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202
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203 Logs an error when a request cannot be fulfilled. By default, it passes the
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204 message to :meth:`log_message`, so it takes the same arguments (*format* and
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205 additional values).
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206
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207
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208 .. method:: BaseHTTPRequestHandler.log_message(format, ...)
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209
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210 Logs an arbitrary message to ``sys.stderr``. This is typically overridden to
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211 create custom error logging mechanisms. The *format* argument is a standard
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212 printf-style format string, where the additional arguments to
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213 :meth:`log_message` are applied as inputs to the formatting. The client address
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214 and current date and time are prefixed to every message logged.
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215
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216
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217 .. method:: BaseHTTPRequestHandler.version_string()
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218
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219 Returns the server software's version string. This is a combination of the
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220 :attr:`server_version` and :attr:`sys_version` class variables.
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221
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222
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223 .. method:: BaseHTTPRequestHandler.date_time_string([timestamp])
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224
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225 Returns the date and time given by *timestamp* (which must be in the format
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226 returned by :func:`time.time`), formatted for a message header. If *timestamp*
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227 is omitted, it uses the current date and time.
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228
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229 The result looks like ``'Sun, 06 Nov 1994 08:49:37 GMT'``.
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230
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231 .. versionadded:: 2.5
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232 The *timestamp* parameter.
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233
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234
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235 .. method:: BaseHTTPRequestHandler.log_date_time_string()
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236
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237 Returns the current date and time, formatted for logging.
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238
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239
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240 .. method:: BaseHTTPRequestHandler.address_string()
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241
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242 Returns the client address, formatted for logging. A name lookup is performed on
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243 the client's IP address.
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244
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245
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246 .. seealso::
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247
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248 Module :mod:`CGIHTTPServer`
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249 Extended request handler that supports CGI scripts.
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250
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251 Module :mod:`SimpleHTTPServer`
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252 Basic request handler that limits response to files actually under the document
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253 root.
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254