Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_js_module.xml @ 2245:87a0e2c73a25
Refactored njs documentation.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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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> |