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annotate xml/en/docs/stream/ngx_stream_js_module.xml @ 2245:87a0e2c73a25

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Refactored njs documentation.
author Yaroslav Zhuravlev <yar@nginx.com>
date Mon, 24 Sep 2018 19:10:29 +0300
parents 467aef18bf12
children 32ba43abf9cd
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Module ngx_stream_js_module"
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10 link="/en/docs/stream/ngx_stream_js_module.html"
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11 lang="en"
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12 rev="15">
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13
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14 <section id="summary">
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15
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16 <para>
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17 The <literal>ngx_stream_js_module</literal> module is used to implement
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18 handlers in <link doc="../njs/index.xml">njs</link> —
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19 a subset of the JavaScript language.
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20 </para>
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21
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22 <para>
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23 This module is not built by default.
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24 Download and install instructions are available
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25 <link doc="../njs/install.xml">here</link>.
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Example Configuration">
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32
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33 <para>
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34 <note>
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35 This example is valid for
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36 njs <link doc="../njs/njs_changes.xml" id="njs-0.2.4">0.2.4</link>.
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37 For njs <link doc="../njs/njs_changes.xml" id="njs-0.2.3">0.2.3</link>
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38 and earlier, use
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39 <link doc="../njs/examples.xml" id="legacy">this</link> example.
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40 </note>
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41 <example>
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42 load_module modules/ngx_stream_js_module.so;
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43 ...
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44
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45 stream {
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46 js_include stream.js;
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47
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48 js_set $bar bar;
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49 js_set $req_line req_line;
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50
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51 server {
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52 listen 12345;
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53
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54 js_preread preread;
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55 return $req_line;
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56 }
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57
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58 server {
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59 listen 12346;
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60
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61 js_access access;
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62 proxy_pass 127.0.0.1:8000;
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63 js_filter header_inject;
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64 }
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65 }
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66
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67 http {
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68 server {
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69 listen 8000;
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70 location / {
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71 return 200 $http_foo\n;
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72 }
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73 }
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74 }
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75 </example>
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76 </para>
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77
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78 <para>
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79 The <path>stream.js</path> file:
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80 <example>
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81 var line = '';
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82
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83 function bar(s) {
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84 var v = s.variables;
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85 s.log("hello from bar() handler!");
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86 return "bar-var" + v.remote_port + "; pid=" + v.pid;
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87 }
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88
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89 function preread(s) {
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90 s.on('upload', function (data, flags) {
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91 var n = data.indexOf('\n');
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92 if (n != -1) {
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93 line = data.substr(0, n);
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94 s.done();
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95 }
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96 });
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97 }
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98
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99 function req_line(s) {
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100 return line;
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101 }
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102
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103 // Read HTTP request line.
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104 // Collect bytes in 'req' until
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105 // request line is read.
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106 // Injects HTTP header into a client's request
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107
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108 var my_header = 'Foo: foo';
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109 function header_inject(s) {
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110 var req = '';
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111 s.on('upload', function(data, flags) {
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112 req += data;
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113 var n = req.search('\n');
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114 if (n != -1) {
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115 var rest = req.substr(n + 1);
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116 req = req.substr(0, n + 1);
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117 s.send(req + my_header + '\r\n' + rest, flags);
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118 s.off('upload');
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119 }
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120 });
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121 }
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122
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123 function access(s) {
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124 if (s.remoteAddress.match('^192.*')) {
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125 s.abort();
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126 return;
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127 }
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128
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129 s.allow();
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130 }
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131 </example>
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132 </para>
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133
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134 </section>
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135
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136
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137 <section id="directives" name="Directives">
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138
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139 <directive name="js_access">
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140 <syntax><value>function</value></syntax>
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141 <default/>
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142 <context>stream</context>
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143 <context>server</context>
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144
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145 <para>
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146 Sets an njs function which will be called at the
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147 <link doc="stream_processing.xml" id="access_phase">access</link> phase.
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148 </para>
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149
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150 </directive>
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151
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152
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153 <directive name="js_filter">
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154 <syntax><value>function</value></syntax>
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155 <default/>
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156 <context>stream</context>
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157 <context>server</context>
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158
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159 <para>
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160 Sets a data filter.
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161 </para>
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162
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163 </directive>
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164
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165
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166 <directive name="js_include">
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167 <syntax><value>file</value></syntax>
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168 <default/>
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169 <context>stream</context>
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170
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171 <para>
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172 Specifies a file that implements server and variable handlers in njs.
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173 </para>
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174
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175 </directive>
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176
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177
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178 <directive name="js_preread">
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179 <syntax><value>function</value></syntax>
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180 <default/>
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181 <context>stream</context>
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182 <context>server</context>
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183
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184 <para>
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185 Sets an njs function which will be called at the
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186 <link doc="stream_processing.xml" id="preread_phase">preread</link> phase.
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187 </para>
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188
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189 </directive>
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190
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191
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192 <directive name="js_set">
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193 <syntax>
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194 <value>$variable</value> <value>function</value></syntax>
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195 <default/>
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196 <context>stream</context>
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197
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198 <para>
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199 Sets an njs function for the specified variable.
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200 </para>
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201
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202 </directive>
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203
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204 </section>
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205
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206
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207 <section id="properties" name="Session Object Properties">
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208
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209 <para>
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210 Each stream njs handler receives one argument, a stream session
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211 <link doc="../njs/njs_api.xml" id="stream_session">object</link>.
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212 </para>
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213
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214 </section>
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215
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216 </module>