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1
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2 Moonbridge reference
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3 ====================
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4
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5
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6
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7 Global function listen{...}
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8 ---------------------------
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9
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10 This function initializes the Moonbridge Network Server. It may be called
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11 multiple times. However, it is not allowed to register additional listeners by
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12 calling listen(...) from a "prepare", "connect", or "finish" handler.
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13
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14 See file "example.lua" for parametrization of the listen(...) function.
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15
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16 Warning: Moonbridge will fork the Lua environment to handle parallel requests.
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17 Functions provided as "prepare", "connect", and "finish" handlers may access
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18 global variables, but for every child process these global variables will not
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19 be shared! If you require a global state, a DBMS, cache server, or similar is
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20 necessary.
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21
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22
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23
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24 Global function timeout(...)
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25 ----------------------------
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26
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27 Calling this function with a positive number (time in seconds) sets a timer
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28 that kills the current process after the selected time runs out. The remaining
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29 time can be queried by calling this function without arguments.
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30
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31 Calling this function with a single argument that is the number zero will
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32 disable the timeout.
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33
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34 Another mode of operation is selected by passing two arguments: a time (in
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35 seconds) as first argument and a function as second argument. In this case, a
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36 sub-timer will be used to limit the execution time of the function. In case of
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37 timeout, the process will be killed (and the timeout function does not return).
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38 If the time for the sub-timer is longer than a previously set timeout (using
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39 the timeout(...) function with one argument), the shorter timeout (of the
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40 previous call of timeout(...)) will have precedence.
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41
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42 Timers are also automatically reset (disabled) when a handler (prepare handler
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43 or connect handler) returns. To shutdown processes after a certain time waiting
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44 for a new request, use the idle_time parameter of the listen function.
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45
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46
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47
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48 Socket object passed to "connect" handler
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49 -----------------------------------------
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50
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51 For every incoming connection, the registered "connect" handler is called with
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52 a single socket object as argument, which is described below:
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53
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54
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55 ### socket:cancel()
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56
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57 Closes the socket connection by sending a TCP RST package if possible to
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58 indicate error condition. Returns true on success, or nil plus error message in
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59 case of an I/O error. Using this method on sockets that have already been
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60 closed (or canceled) will throw an error.
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61
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62 Warning: Previously sent (and flushed) data may be lost during transmission.
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63
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64
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65 ### socket:close(timeout)
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66
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67 Closes the socket connection (input and output stream) by flushing all data and
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68 sending a TCP FIN package. Returns true on success, or nil plus error message
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69 in case of an I/O error. Using this method on sockets that have already been
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70 closed (or canceled) will throw an error.
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71
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72 Warning: Pending data on the input stream may cause connection aborts (TCP RST)
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73 depending on the particular operating system used. All pending input data
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74 should have been read before calling socket:close().
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75
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76 The optional timeout parameter may be used to wait until all data has been sent
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77 out, or until the timeout elapses (in which case a TCP RST is sent) whichever
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78 happens first. A timeout value of 0 or nil causes immediate return and sending
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79 of pending data in background (recommended).
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80
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81
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82 ### socket:flush()
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83
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84 Alias for socket.output:flush()
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85
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86
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87 ### socket.input
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88
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89 Lua file handle representing the input stream of the socket connection.
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90 Supports the same methods as io.open()'s return values.
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91
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92
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93 ### socket.interval
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94
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95 Set to the name of an interval timer if the "connect" handler was called due to
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96 an elapsed interval timer. Otherwise nil.
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97
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98
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99 ### socket:lines()
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100
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101 Alias for socket.input:lines()
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102
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103
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104 ### socket.local_ip4
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105
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106 Local IPv4 address used for the connection. Encoded as 4 raw bytes in form of a
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107 string.
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108
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109
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110 ### socket.local_ip6
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111
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112 Local IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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113 a string.
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114
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115
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116 ### socket.local_tcpport
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117
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118 Local TCP port used for the connection.
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119
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120
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121 ### socket.output
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122
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123 Lua file handle representing the output stream of the socket connection.
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124 Supports the same methods as io.open()'s return values.
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125
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126
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127 ### socket:read(...)
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128
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129 Alias for socket.input:read()
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130
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131
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132 ### socket:readuntil(terminator, maxlen)
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133
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134 Reads as many bytes until a byte equal to the terminator value occurs. An
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135 optional maximum length may be specified. The terminating byte is included in
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136 the return value (unless the maximum length would be exceeded). On EOF, nil is
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137 returned. In case of an I/O error, nil (as first result value) plus an error
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138 message (as second result value) is returned.
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139
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140 This method is also available as :readuntil(...) for any other Lua file handle
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141 (including socket.input).
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142
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143
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144 ### socket.remote_ip4
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145
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146 Remote IPv4 address used for the connection. Encoded as 4 raw bytes in form of
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147 a string.
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148
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149
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150 ### socket.remote_ip6
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151
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152 Remote IPv6 address used for the connection. Encoded as 16 raw bytes in form of
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153 a string.
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154
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155
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156 ### socket.remote_tcpport
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157
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158 Remote TCP port used for the connection.
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159
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160
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161 ### socket:write(...)
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162
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163 Alias for socket.output:write(...)
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164
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165
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166
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167 HTTP module
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168 -----------
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169
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170 The http module exports the function http.generate_handler(callback) that
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171 converts an HTTP handler to a "connect" handler. See file "example.lua" for an
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172 example of invocation. A table with options may be passed either as a second
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173 argument, or as a first argument preceeding the callback function (whichever is
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174 more convenient).
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175
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176 The following options are supported:
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177
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178 - request_body_size_limit: maximum size of payload of HTTP request body
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179 (transfer encoding is allowed to add a limited amount of extra data)
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180 - chunk_size: optional default value for maximum_input_chunk_size and
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181 minimum_output_chunk_size
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182 - request_header_size_limit: maximum size of HTTP request headers
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183 - maximum_input_chunk_size: maximum chunk size when streaming a request body or
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184 certain POST fields (bigger chunks will be fragmented automatically)
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185 - minimum_output_chunk_size: minimum size for a chunk when sending a response
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186 body (smaller chunks will be buffered and concatenated with future data;
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187 ignored when request:flush() is called)
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188 - static_headers: a set of headers to be included in every HTTP response
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189 (may be a string, a table or strings, or a table of key-value pairs)
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190
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191 The callback function receives a single request object as argument, which is
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192 described below.
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193
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194
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195 ### request.body
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196
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197 The request body (without headers) as a string. Accessing this value makes
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198 further access to request.post_params and request.post_params_list, or
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199 invocation of request:stream_request_body(...) impossible.
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200
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201
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202 ### request.cookies
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203
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204 A table with all cookies sent by the client.
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205
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206
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207 ### request.defer_reading()
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208
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209 Disables automatic request body processing on write. Can be called before
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210 sending a HTTP status code to send a response before the request has been fully
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211 received.
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212
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213 CAUTION: Responding to a request before the request body has been processed may
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214 lead to a deadlock if the browser does not process the response while trying to
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215 send the request. Therefore, this function should only be used if:
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216
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217 - the TCP stack has enough buffer space for the response (i.e. if the response
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218 is small enough), and if
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219 - a timer is used to cancel the response in case of a deadlock.
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220
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221 It is recommended to not use this function unless certain performance tweaks
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222 are desired.
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223
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224
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225 ### request.faulty
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226
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227 Normally set to false. In case of a read or write error on the client
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228 connection, this value is set to true before a Lua error is raised.
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229
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230 A faulty request handle must not be used, or another Lua error will be raised.
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231
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232
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233 ### request:finish()
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234
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235 Finishes and flushes a HTTP response. May be called multiple times. An
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236 HTTP status, all headers, and the response body (if applicable) must have been
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237 previously sent. After calling this method, no further data may be written.
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238
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239
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240 ### request:finish_headers()
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241
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242 Finishes and flushes the HTTP response header section. May be called multiple
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243 times, as long as the request is not finished completely. This method is
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244 automatically invoked if the application is beginning to send a response body.
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245 After calling this method, no further headers may be sent.
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246
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247
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248 ### request:flush()
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249
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250 Flushes any pending output data. Note: In order to mark the end of a response
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251 body, it is required to call request:finish().
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252
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253
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254 ### request.get_params
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255
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256 A table that maps field names to their corresponding GET value. If there are
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257 several GET values with the given field name, then the first value is used.
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258
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259 Note: May be implemented through metamethods, but does support iteration
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260 through pairs(...).
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261
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262
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263 ### request.get_params_list
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264
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265 A table that maps field names to a sequence of their corresponding GET values.
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266
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267 Note: May be implemented through metamethods, but does support iteration
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268 through pairs(...).
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269
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270
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271 ### request.headers
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272
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273 A table that maps (case-insensitively) a HTTP header field name to a sequence
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274 of values. One entry is created for every occurrence of a header line with the
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275 given field name).
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276
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277
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278 ### request.headers_csv_string
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279
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280 A table that maps (case-insensitively) a HTTP header field name to a comma
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281 separated string. Multiple occurrences of the header with the given field name
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282 are automatically merged into the comma separated string.
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283
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284
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285 ### request.headers_csv_table
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286
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287 A table that maps (case-insensitively) a HTTP header field name to a sequence
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288 of values. One entry is created for every comma separated value of each header
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289 with the given field name.
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290
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291
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292 ### request.headers_flags
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293
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294 A table that maps (case-insensitively) a HTTP header field name to another
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295 table which (again case-insensitively) maps a string to a boolean, depending on
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296 whether this string occurred in the list of comma separated values of one
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297 header line with the given field name that was the key in the first table.
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298
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299
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300 ### request.headers_value
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301
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302 A table that maps (case-insensitively) a HTTP header field name to a value. If
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303 multiple header lines with the given field name have been received, false is
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304 used as value.
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305
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306
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307 ### request.method
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308
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309 The HTTP request method, e.g. "HEAD", "GET", or "POST".
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310
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311
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312 ### request.path
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313
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314 The requested path without a leading slash and without the query part (e.g.
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315 "index.html" if "/index.html?a=b&c=d" has been requested). For the query part,
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316 see request.query.
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317
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318 This value will be nil if (and only if) the request method is "OPTIONS" with a
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319 request target equal to "*" (see also asterisk-form of request-target in
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320 section 5.3.4 in RFC 7230).
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321
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322
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323 ### request.post_metadata
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324
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325 Only set for multipart/form-data POST requests. A table that maps field names
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326 to their corresponding POST metadata table which contains two entries:
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327 "file_name" and "content_type". If there are several POST values with the given
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328 field name, then the first value/file is used.
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329
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330
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331 ### request.post_metadata_list
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332
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333 Only set for multipart/form-data POST requests. A table that maps field names
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334 to a sequence with their corresponding POST metadata tables. Needed if multiple
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335 files are uploaded with the same field name.
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336
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337
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338 ### request.post_params
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339
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340 A table that maps field names to their corresponding POST value. If there are
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341 several POST values with the given field name, then the first value is used.
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342
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343 Note: May be implemented through metamethods, but does support iteration
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344 through pairs(...).
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345
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346
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347 ### request.post_params_list
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348
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349 A table that maps field names to a sequence of their corresponding POST values.
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350
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351 Note: May be implemented through metamethods, but does support iteration
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352 through pairs(...).
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353
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354
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355 ### request.query
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356
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357 Query part of the request target including the leading question mark, e.g.
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358 "?a=b&c=d" if the requested target is "/index.html?a=b&c=d". The data is
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359 automatically parsed and made available through request.get_params and
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360 request.get_params_list.
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361
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362 If there is no query part given in the request target, then this string is
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363 the empty string. This value will be nil if (and only if) the request method
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364 is "OPTIONS" with a request target equal to "*" (see also asterisk-form of
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365 request-target in section 5.3.4 in RFC 7230).
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366
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367
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368 ### request:process_request_body()
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369
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370 Starts processing the request body (if existent) to set the values
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371 request.post_params, request.post_params_list, request.post_metadata, and
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372 and request.post_metadata_list and/or to call POST field stream handlers that
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373 have been previously registered with request:stream_post_param(...) or
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374 request:stream_post_params(...).
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375
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376 This method gets invoked automatically when the POST param tables
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377 (request.post_params, etc.) are accessed, or if a response is sent (to avoid
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378 deadlocks with the webbrowser). (Note: Automatic request body processing on
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379 write may be disabled by calling request:defer_reading().)
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380
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381 After this method returned, all registered POST field stream handlers have
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382 received all data. Registration of other POST field stream handlers is not
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383 possible after this method has been called (or after request.post_params_list
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384 or request.post_params have been accessed).
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385
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386
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387 ### request:send_data(...)
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388
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389 Sends data as response body. All arguments are converted via tostring(...) and
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390 concatenated. May be called multiple times until the request has been finished
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391 by calling request:finish().
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392
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393 If the request method (see request.method) is "HEAD", then calls to
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394 request:send_data(...) are automatically ignored.
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395
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396
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397 ### request:send_header(key, value)
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398
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399 Sends a HTTP response header that consists of the given key and the given
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400 value. Note: Key and value must be provided as separate arguments. Before any
|
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401 headers can be sent, a HTTP status must have been set with
|
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402 request:send_status(status_string).
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403
|
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404
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405 ### request:send_status(status_string)
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406
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407 Sends a HTTP response status that is given as a string consisting of a 3-digit
|
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408 number and an explanatory string, e.g. "200 OK" or "404 Not Found". This
|
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409 function must be called once before any headers or response body data may be
|
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410 sent.
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411
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412
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413 ### request.socket
|
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414
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415 The underlaying socket. Can be used to force a TCP RST, etc.
|
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416
|
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417
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418 ### request:stream_post_param(field_name, callback)
|
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419
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420 Registers a stream handler for the given POST parameter. The callback function
|
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421 will be called in the following manner:
|
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422
|
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423 - For the initial chunk, the first chunk gets passed as first argument while a
|
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424 table with metadata ("field_name" and "content_type") gets passed as second
|
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425 argument. In case of an immediate EOF (i.e. an empty file), the passed
|
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426 chunk is the empty string. In all other cases the chunk has a length greater
|
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427 than zero.
|
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428 - For any remaining chunks, the respective chunk gets passed as first and only
|
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429 argument (no metadata). Here, the chunk has always a length greater than
|
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430 zero.
|
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431 - To indicate the end of the stream, the callback function is called without
|
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432 arguments. This also happens in case of an immediate EOF (see above).
|
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|
433
|
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434 In case of an immediate EOF (i.e. an empty file), the callback function is thus
|
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435 called as follows:
|
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|
436
|
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437 - The first time with an empty string as first argument, and with the metadata
|
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|
438 as second argument.
|
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|
439 - The second time without any arguments.
|
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|
440
|
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|
441
|
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|
442 ### request:stream_post_params(pattern, callback)
|
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|
443
|
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444 Same as request:stream_post_param(...) but providing a string pattern to match
|
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|
445 multiple field names (e.g. "^file_[0-9]+$").
|
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|
446
|
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|
447
|
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|
448 ### request:stream_request_body(callback)
|
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|
449
|
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|
450 Start streaming of request body. For each chunk of the request body, the
|
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|
451 callback function is called with the corresponding chunk. End of data is
|
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|
452 indicated through return of request:stream_request_body(...) (not by calling
|
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|
453 the callback without arguments).
|
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|
454
|
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|
455 The function may be called with nil instead of a callback function. In this
|
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|
456 case, the request body is read and discarded. Only if nil is passed instead of
|
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|
457 a callback, then the function may also be invoked when the request body has
|
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|
458 already been read and/or processed. In the latter case, the function performs
|
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|
459 no operation.
|
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|
460
|
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|
461
|