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annotate Doc/lib/libbasehttp.tex @ 8831:00a6bb65ff29 legacy-trunk

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Getting rid of this ancient stuff.
author Guido van Rossum <guido@python.org>
date Wed, 05 Aug 1998 21:10:09 +0000
parents 760dcf197048
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1 \section{Standard Module \module{BaseHTTPServer}}
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2 \declaremodule{standard}{BaseHTTPServer}
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3
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4 \modulesynopsis{Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer).}
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5
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6
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7 \indexii{WWW}{server}
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8 \indexii{HTTP}{protocol}
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9 \index{URL}
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10 \index{httpd}
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11
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12
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13 This module defines two classes for implementing HTTP servers
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14 (web servers). Usually, this module isn't used directly, but is used
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15 as a basis for building functioning web servers. See the
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16 \module{SimpleHTTPServer} and \module{CGIHTTPServer} modules.
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17 \refstmodindex{SimpleHTTPServer}
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18 \refstmodindex{CGIHTTPServer}
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19
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20 The first class, \class{HTTPServer}, is a
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21 \class{SocketServer.TCPServer} subclass. It creates and listens at the
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22 web socket, dispatching the requests to a handler. Code to create and
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23 run the server looks like this:
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24
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25 \begin{verbatim}
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26 def run(server_class=BaseHTTPServer.HTTPServer,
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27 handler_class=BaseHTTPServer.BaseHTTPRequestHandler):
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28 server_address = ('', 8000)
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29 httpd = server_class(server_address, handler_class)
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30 httpd.serve_forever()
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31 \end{verbatim}
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32
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33 \begin{classdesc}{HTTPServer}{server_address, RequestHandlerClass}
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34 This class builds on the \class{TCPServer} class by
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35 storing the server address as instance
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36 variables named \member{server_name} and \member{server_port}. The
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37 server is accessible by the handler, typically through the handler's
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38 \member{server} instance variable.
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39 \end{classdesc}
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41 \begin{classdesc}{BaseHTTPRequestHandler}{request, client_address, server}
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42 This class is used
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43 to handle the HTTP requests that arrive at the server. By itself,
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44 it cannot respond to any actual HTTP requests; it must be subclassed
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45 to handle each request method (e.g. GET or POST).
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46 \class{BaseHTTPRequestHandler} provides a number of class and instance
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47 variables, and methods for use by subclasses.
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48
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49 The handler will parse the request and the headers, then call a
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50 method specific to the request type. The method name is constructed
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51 from the request. For example, for the request method \samp{SPAM}, the
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52 \method{do_SPAM()} method will be called with no arguments. All of
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53 the relevant information is stored in instance variables of the
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54 handler. Subclasses should not need to override or extend the
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55 \method{__init__()} method.
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56 \end{classdesc}
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58
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59 \class{BaseHTTPRequestHandler} has the following instance variables:
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60
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61 \begin{memberdesc}{client_address}
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62 Contains a tuple of the form \code{(\var{host}, \var{port})} referring
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63 to the client's address.
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64 \end{memberdesc}
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65
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66 \begin{memberdesc}{command}
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67 Contains the command (request type). For example, \code{'GET'}.
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68 \end{memberdesc}
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69
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70 \begin{memberdesc}{path}
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71 Contains the request path.
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72 \end{memberdesc}
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73
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74 \begin{memberdesc}{request_version}
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75 Contains the version string from the request. For example,
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76 \code{'HTTP/1.0'}.
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77 \end{memberdesc}
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78
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79 \begin{memberdesc}{headers}
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80 Holds an instance of the class specified by the \member{MessageClass}
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81 class variable. This instance parses and manages the headers in
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82 the HTTP request.
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83 \end{memberdesc}
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84
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85 \begin{memberdesc}{rfile}
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86 Contains an input stream, positioned at the start of the optional
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87 input data.
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88 \end{memberdesc}
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89
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90 \begin{memberdesc}{wfile}
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91 Contains the output stream for writing a response back to the client.
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92 Proper adherance to the HTTP protocol must be used when writing
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93 to this stream.
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94 \end{memberdesc}
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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 \begin{memberdesc}{server_version}
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100 Specifies the server software version. You may want to override
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101 this.
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102 The format is multiple whitespace-separated strings,
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103 where each string is of the form name[/version].
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104 For example, \code{'BaseHTTP/0.2'}.
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105 \end{memberdesc}
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106
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107 \begin{memberdesc}{sys_version}
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108 Contains the Python system version, in a form usable by the
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109 \member{version_string} method and the \member{server_version} class
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110 variable. For example, \code{'Python/1.4'}.
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111 \end{memberdesc}
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112
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113 \begin{memberdesc}{error_message_format}
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114 Specifies a format string for building an error response to the
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115 client. It uses parenthesized, keyed format specifiers, so the
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116 format operand must be a dictionary. The \var{code} key should
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117 be an integer, specifing the numeric HTTP error code value.
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118 \var{message} should be a string containing a (detailed) error
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119 message of what occurred, and \var{explain} should be an
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120 explanation of the error code number. Default \var{message}
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121 and \var{explain} values can found in the \var{responses}
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122 class variable.
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123 \end{memberdesc}
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124
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125 \begin{memberdesc}{protocol_version}
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126 This specifies the HTTP protocol version used in responses.
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127 Typically, this should not be overridden. Defaults to
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128 \code{'HTTP/1.0'}.
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129 \end{memberdesc}
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130
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131 \begin{memberdesc}{MessageClass}
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132 Specifies a \class{rfc822.Message}-like class to parse HTTP
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133 headers. Typically, this is not overridden, and it defaults to
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134 \class{mimetools.Message}.
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135 \withsubitem{(in module mimetools)}{\ttindex{Message}}
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136 \end{memberdesc}
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137
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138 \begin{memberdesc}{responses}
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139 This variable contains a mapping of error code integers to two-element
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140 tuples containing a short and long message. For example,
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141 \code{\{\var{code}: (\var{shortmessage}, \var{longmessage})\}}. The
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142 \var{shortmessage} is usually used as the \var{message} key in an
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143 error response, and \var{longmessage} as the \var{explain} key
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144 (see the \member{error_message_format} class variable).
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145 \end{memberdesc}
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146
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147
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148 A \class{BaseHTTPRequestHandler} instance has the following methods:
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149
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150 \begin{methoddesc}{handle}{}
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151 Overrides the superclass' \method{handle()} method to provide the
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152 specific handler behavior. This method will parse and dispatch
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153 the request to the appropriate \method{do_*()} method.
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154 \end{methoddesc}
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155
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156 \begin{methoddesc}{send_error}{code\optional{, message}}
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157 Sends and logs a complete error reply to the client. The numeric
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158 \var{code} specifies the HTTP error code, with \var{message} as
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159 optional, more specific text. A complete set of headers is sent,
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160 followed by text composed using the \member{error_message_format}
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161 class variable.
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162 \end{methoddesc}
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163
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164 \begin{methoddesc}{send_response}{code\optional{, message}}
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165 Sends a response header and logs the accepted request. The HTTP
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166 response line is sent, followed by \emph{Server} and \emph{Date}
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167 headers. The values for these two headers are picked up from the
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168 \method{version_string()} and \method{date_time_string()} methods,
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169 respectively.
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170 \end{methoddesc}
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171
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172 \begin{methoddesc}{send_header}{keyword, value}
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173 Writes a specific MIME header to the output stream. \var{keyword}
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174 should specify the header keyword, with \var{value} specifying
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175 its value.
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176 \end{methoddesc}
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177
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178 \begin{methoddesc}{end_headers}{}
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179 Sends a blank line, indicating the end of the MIME headers in
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180 the response.
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181 \end{methoddesc}
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182
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183 \begin{methoddesc}{log_request}{\optional{code\optional{, size}}}
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184 Logs an accepted (successful) request. \var{code} should specify
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185 the numeric HTTP code associated with the response. If a size of
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186 the response is available, then it should be passed as the
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187 \var{size} parameter.
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188 \end{methoddesc}
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189
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190 \begin{methoddesc}{log_error}{...}
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191 Logs an error when a request cannot be fulfilled. By default,
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192 it passes the message to \method{log_message()}, so it takes the
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193 same arguments (\var{format} and additional values).
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194 \end{methoddesc}
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195
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196 \begin{methoddesc}{log_message}{format, ...}
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197 Logs an arbitrary message to \code{sys.stderr}. This is typically
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198 overridden to create custom error logging mechanisms. The
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199 \var{format} argument is a standard printf-style format string,
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200 where the additional arguments to \method{log_message()} are applied
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201 as inputs to the formatting. The client address and current date
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202 and time are prefixed to every message logged.
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203 \end{methoddesc}
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204
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205 \begin{methoddesc}{version_string}{}
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206 Returns the server software's version string. This is a combination
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207 of the \member{server_version} and \member{sys_version} class variables.
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208 \end{methoddesc}
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209
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210 \begin{methoddesc}{date_time_string}{}
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211 Returns the current date and time, formatted for a message header.
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212 \end{methoddesc}
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213
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214 \begin{methoddesc}{log_data_time_string}{}
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215 Returns the current date and time, formatted for logging.
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216 \end{methoddesc}
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217
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218 \begin{methoddesc}{address_string}{}
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219 Returns the client address, formatted for logging. A name lookup
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220 is performed on the client's IP address.
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221 \end{methoddesc}