Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_js_module.xml @ 2222:0974dc0a6209
Changed link from upstream_conf to api in "state".
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 07 May 2018 14:45:49 +0300 |
parents | dfc49994218c |
children | 5268c13196f2 |
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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="12"> |
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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_about.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_about.xml" id="install">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 <example> |
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35 load_module modules/ngx_stream_js_module.so; |
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36 ... |
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37 |
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38 stream { |
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39 js_include stream.js; |
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40 |
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41 js_set $foo foo; |
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42 js_set $bar bar; |
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43 |
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44 server { |
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45 listen 12345; |
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46 |
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47 js_preread qux; |
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48 return $foo; |
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49 } |
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50 |
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51 server { |
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52 listen 12346; |
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53 |
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54 js_access xyz; |
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55 proxy_pass 127.0.0.1:8000; |
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56 js_filter baz; |
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57 } |
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58 } |
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59 |
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60 http { |
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61 server { |
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62 listen 8000; |
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63 location / { |
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64 return 200 $http_foo\n; |
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65 } |
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66 } |
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67 } |
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68 </example> |
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69 </para> |
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70 |
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71 <para> |
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72 The <path>stream.js</path> file: |
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73 <example> |
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74 var req = ''; |
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75 var matched = 0; |
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76 var line = ''; |
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77 |
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78 function qux(s) { |
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79 var n = s.buffer.indexOf('\n'); |
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80 if (n == -1) { |
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81 return s.AGAIN; |
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82 } |
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83 |
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84 line = s.buffer.substr(0, n); |
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85 } |
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86 |
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87 function foo(s) { |
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88 return line; |
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89 } |
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90 |
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91 function bar(s) { |
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92 var v = s.variables; |
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93 s.log("hello from bar() handler!"); |
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94 return "foo-var" + v.remote_port + "; pid=" + v.pid; |
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95 } |
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96 |
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97 // The filter processes one buffer per call. |
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98 // The buffer is available in s.buffer both for |
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99 // reading and writing. Called for both directions. |
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100 |
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101 function baz(s) { |
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102 if (s.fromUpstream || matched) { |
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103 return; |
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104 } |
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105 |
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106 // Disable certain addresses. |
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107 |
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108 if (s.remoteAddress.match('^192.*')) { |
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109 return s.ERROR; |
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110 } |
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111 |
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112 // Read HTTP request line. |
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113 // Collect bytes in 'req' until request |
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114 // line is read. Clear current buffer to |
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115 // disable output. |
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116 |
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117 req = req + s.buffer; |
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118 s.buffer = ''; |
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119 |
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120 var n = req.search('\n'); |
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121 |
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122 if (n != -1) { |
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123 // Inject a new HTTP header. |
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124 var rest = req.substr(n + 1); |
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125 req = req.substr(0, n + 1); |
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126 |
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127 var addr = s.remoteAddress; |
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128 |
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129 s.log('req:' + req); |
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130 s.log('rest:' + rest); |
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131 |
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132 // Output the result and skip further |
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133 // processing. |
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134 |
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135 s.buffer = req + 'Foo: addr_' + addr + '\r\n' + rest; |
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136 matched = 1; |
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137 } |
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138 } |
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139 |
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140 function xyz(s) { |
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141 if (s.remoteAddress.match('^192.*')) { |
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142 return s.ABORT; |
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143 } |
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144 } |
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145 </example> |
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146 </para> |
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147 |
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148 </section> |
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149 |
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150 |
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151 <section id="directives" name="Directives"> |
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152 |
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153 <directive name="js_access"> |
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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 an njs function which will be called at the |
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161 <link doc="stream_processing.xml" id="access_phase">access</link> phase. |
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162 </para> |
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163 |
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164 </directive> |
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165 |
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166 |
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167 <directive name="js_filter"> |
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168 <syntax><value>function</value></syntax> |
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169 <default/> |
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170 <context>stream</context> |
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171 <context>server</context> |
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172 |
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173 <para> |
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174 Sets a data filter. |
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175 </para> |
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176 |
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177 </directive> |
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178 |
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179 |
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180 <directive name="js_include"> |
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181 <syntax><value>file</value></syntax> |
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182 <default/> |
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183 <context>stream</context> |
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184 |
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185 <para> |
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186 Specifies a file that implements server and variable handlers in njs. |
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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_preread"> |
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193 <syntax><value>function</value></syntax> |
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194 <default/> |
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195 <context>stream</context> |
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196 <context>server</context> |
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197 |
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198 <para> |
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199 Sets an njs function which will be called at the |
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200 <link doc="stream_processing.xml" id="preread_phase">preread</link> phase. |
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201 </para> |
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202 |
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203 </directive> |
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204 |
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205 |
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206 <directive name="js_set"> |
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207 <syntax> |
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208 <value>$variable</value> <value>function</value></syntax> |
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209 <default/> |
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210 <context>stream</context> |
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211 |
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212 <para> |
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213 Sets an njs function for the specified variable. |
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214 </para> |
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215 |
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216 </directive> |
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217 |
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218 </section> |
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219 |
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220 |
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221 <section id="properties" name="Session Object Properties"> |
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222 |
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223 <para> |
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224 Each stream njs handler receives one argument, a stream session |
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225 <link doc="../njs/njs_api.xml" id="stream_session">object</link>. |
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226 </para> |
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227 |
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228 </section> |
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229 |
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230 </module> |