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annotate xml/en/docs/http/ngx_http_ssi_module.xml @ 399:a56540cdcea5

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English translation of ngx_http_ssi_module.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 07 Feb 2012 11:01:25 +0000
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children 694db9597ee0
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a56540cdcea5 English translation of ngx_http_ssi_module.
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Module ngx_http_ssi_module"
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6 link="/en/docs/http/ngx_http_ssi_module.html"
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7 lang="en">
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8
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9 <section id="summary">
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10
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11 <para>
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12 The <literal>ngx_http_ssi_module</literal> module is a filter
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13 that processes SSI (Server Side Includes) commands in responses
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14 passing through it.
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15 Currently, the list of supported SSI commands is incomplete.
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16 </para>
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17
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18 </section>
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19
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20
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21 <section id="example" name="Example Configuration">
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22
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23 <para>
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24 <example>
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25 location / {
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26 ssi on;
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27 ...
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28 }
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29 </example>
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30 </para>
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31
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32 </section>
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33
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34
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35 <section id="directives" name="Directives">
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36
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37 <directive name="ssi">
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38 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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39 <default>off</default>
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40 <context>http</context>
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41 <context>server</context>
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42 <context>location</context>
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43 <context>if in location</context>
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44
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45 <para>
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46 Enables or disables processing of SSI commands in responses.
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47 </para>
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48
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49 </directive>
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50
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51
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52 <directive name="ssi_silent_errors">
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53 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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54 <default>off</default>
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55 <context>http</context>
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56 <context>server</context>
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57 <context>location</context>
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58
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59 <para>
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60 Allows to suppress output of the string
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61 “<literal>[an error occurred while processing the directive]</literal>”
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62 if an error occurred during SSI processing.
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63 </para>
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64
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65 </directive>
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66
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67
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68 <directive name="ssi_types">
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69 <syntax><value>mime-type</value> ...</syntax>
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70 <default>text/html</default>
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71 <context>http</context>
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72 <context>server</context>
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73 <context>location</context>
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74
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75 <para>
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76 Enables processing of SSI commands in responses with the specified MIME types
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77 in addition to “<literal>text/html</literal>”.
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78 </para>
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79
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80 </directive>
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81
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82 </section>
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83
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84
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85 <section id="commands" name="SSI Commands">
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86
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87 <para>
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88 SSI commands have the following generic format:
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89 <example>
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90 &lt;!--# command parameter1=value1 parameter2=value2 ... --&gt;
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91 </example>
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92 </para>
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93
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94 <para>
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95 The following commands are supported:
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96 <list type="tag">
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97
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98 <tag-name><literal>block</literal></tag-name>
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99 <tag-desc>
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100 Defines a block that can be used as a stub
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101 in the <literal>include</literal> command.
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102 The block can contain other SSI commands.
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103 The command has the following parameter:
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104
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105 <list type="tag">
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106 <tag-name><literal>name</literal></tag-name>
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107 <tag-desc>
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108 block name.
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109 </tag-desc>
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110 </list>
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111
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112 Example:
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113 <example>
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114 &lt;!--# block name="one" --&gt;
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115 stub
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116 &lt;!--# endblock --&gt;
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117 </example>
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118
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119 </tag-desc>
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120
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121
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122 <tag-name><literal>config</literal></tag-name>
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123 <tag-desc>
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124 Sets some parameters used during SSI processing, namely:
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125
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126 <list type="tag">
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127 <tag-name><literal>errmsg</literal></tag-name>
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128 <tag-desc>
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129 a string that is output if an error occurs during SSI processing.
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130 By default, the following string is output:
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131 <example>
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132 [an error occurred while processing the directive]
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133 </example>
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134 </tag-desc>
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135
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136 <tag-name><literal>timefmt</literal></tag-name>
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137 <tag-desc>
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138 a format string passed to the <c-func>strftime</c-func> function
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139 used to output date and time.
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140 By default, the following format is used:
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141 <example>
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142 "%A, %d-%b-%Y %H:%M:%S %Z"
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143 </example>
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144 The “<literal>%s</literal>” format is suitable to output time in seconds.
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145 </tag-desc>
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146 </list>
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147
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148 </tag-desc>
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149
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150
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151 <tag-name><literal>echo</literal></tag-name>
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152 <tag-desc>
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153 Outputs the value of a variable.
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154 The command has the following parameters:
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155
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156 <list type="tag">
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157 <tag-name><literal>var</literal></tag-name>
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158 <tag-desc>
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159 variable name.
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160 </tag-desc>
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161
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162 <tag-name><literal>encoding</literal></tag-name>
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163 <tag-desc>
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164 encoding method.
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165 Possible values include <literal>none</literal>, <literal>url</literal>, and
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166 <literal>entity</literal>.
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167 By default, <literal>entity</literal> is used.
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168 </tag-desc>
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169
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170 <tag-name><literal>default</literal></tag-name>
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171 <tag-desc>
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172 non-standard parameter that sets a string to be output
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173 if a variable is undefined.
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174 By default, “<literal>none</literal>” is output.
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175 The command
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176 <example>
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177 &lt;!--# echo var="name" default="<emphasis>no</emphasis>" --&gt;
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178 </example>
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179 replaces the following sequence of commands:
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180 <example>
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181 &lt;!--# if expr="$name" --&gt;&lt;!--# echo var="name" --&gt;&lt;!--#
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182 else --&gt;<emphasis>no</emphasis>&lt;!--# endif --&gt;
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183 </example>
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184 </tag-desc>
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185 </list>
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186
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187 </tag-desc>
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188
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189
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190 <tag-name><literal>if</literal></tag-name>
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191 <tag-desc>
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192 Performs a conditional inclusion.
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193 The following commands are supported:
a56540cdcea5 English translation of ngx_http_ssi_module.
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194 <example>
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195 &lt;!--# if expr="..." --&gt;
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196 ...
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197 &lt;!--# elif expr="..." --&gt;
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198 ...
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199 &lt;!--# else --&gt;
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200 ...
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201 &lt;!--# endif --&gt;
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202 </example>
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203 Only one level of nesting is currently supported.
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204 The command has the following parameter:
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205
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206 <list type="tag">
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207 <tag-name><literal>expr</literal></tag-name>
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208 <tag-desc>
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209 expression.
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210 An expression can be:
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211
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212 <list type="bullet">
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213
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214 <listitem>
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215 variable existence check:
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216 <example>
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217 &lt;!--# if expr="$name" --&gt;
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218 </example>
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219 </listitem>
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220
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221 <listitem>
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222 comparison of a variable with a text:
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223 <example>
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224 &lt;!--# if expr="$name = <value>text</value>" --&gt;
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225 &lt;!--# if expr="$name != <value>text</value>" --&gt;
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226 </example>
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227 </listitem>
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228
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229 <listitem>
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230 comparison of a variable with a regular expression:
a56540cdcea5 English translation of ngx_http_ssi_module.
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231 <example>
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232 &lt;!--# if expr="$name = /<value>text</value>/" --&gt;
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233 &lt;!--# if expr="$name != /<value>text</value>/" --&gt;
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234 </example>
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235 </listitem>
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236 </list>
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237
a56540cdcea5 English translation of ngx_http_ssi_module.
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238 If a <value>text</value> contains variables,
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239 their values are substituted.
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240 A regular expression can contain positional and named captures
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241 that can later be used through variables, for example:
a56540cdcea5 English translation of ngx_http_ssi_module.
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242 <example>
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243 &lt;!--# if expr="$name = /(.+)@(?P&lt;domain&gt;.+)/" --&gt;
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244 &lt;!--# echo var="1" --&gt;
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245 &lt;!--# echo var="domain" --&gt;
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246 &lt;!--# endif --&gt;
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247 </example>
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248 </tag-desc>
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249 </list>
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250
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251 </tag-desc>
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252
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253
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254 <tag-name><literal>include</literal></tag-name>
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255 <tag-desc>
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256 Includes the result of another request into a response.
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257 The command has the following parameters:
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258
a56540cdcea5 English translation of ngx_http_ssi_module.
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259 <list type="tag">
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260 <tag-name><literal>file</literal></tag-name>
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261 <tag-desc>
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262 specifies an included file, for example:
a56540cdcea5 English translation of ngx_http_ssi_module.
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263 <example>
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264 &lt;!--# include file="footer.html" --&gt;
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265 </example>
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266 </tag-desc>
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267
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268 <tag-name><literal>virtual</literal></tag-name>
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269 <tag-desc>
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270 specifies an included request, for example:
a56540cdcea5 English translation of ngx_http_ssi_module.
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271 <example>
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272 &lt;!--# include virtual="/remote/body.php?argument=value" --&gt;
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273 </example>
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274 Several requests specified on one page and processed by proxied or
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275 FastCGI servers run in parallel.
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276 If sequential processing is desired, the <literal>wait</literal>
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277 parameter should be used.
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278 </tag-desc>
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279
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280 <tag-name><literal>stub</literal></tag-name>
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281 <tag-desc>
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282 non-standard parameter that names the block whose
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283 content will be output if an included request results in an empty
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284 body or if an error occurs during request processing, for example:
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285 <example>
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286 &lt;!--# block name="one" --&gt;&amp;nbsp;&lt;!--# endblock --&gt;
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287 &lt;!--# include virtual="/remote/body.php?argument=value" stub="one" --&gt;
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288 </example>
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289 The replacement block content is processed in the included request context.
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290 </tag-desc>
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291
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292 <tag-name><literal>wait</literal></tag-name>
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293 <tag-desc>
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294 non-standard parameter that instructs to wait for a request to fully
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295 complete before continuing with SSI processing, for example:
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296 <example>
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297 &lt;!--# include virtual="/remote/body.php?argument=value" wait="yes" --&gt;
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298 </example>
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299 </tag-desc>
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300
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301 <tag-name><literal>set</literal></tag-name>
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302 <tag-desc>
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303 non-standard parameter that instructs to write a successful result
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304 of request processing to the specified variable,
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305 for example:
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306 <example>
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307 &lt;!--# include virtual="/remote/body.php?argument=value" set="one" --&gt;
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308 </example>
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309 It should be noted that only the results of responses obtained using the
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310 <link doc="ngx_http_proxy_module.xml">ngx_http_proxy_module</link> and
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311 <link doc="ngx_http_memcached_module.xml">ngx_http_memcached_module</link>
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312 modules can be written into variables.
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313 </tag-desc>
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314
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315 </list>
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316
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317 </tag-desc>
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318
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319
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320 <tag-name><literal>set</literal></tag-name>
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321 <tag-desc>
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322 Sets a value of a variable.
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323 The command has the following parameters:
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324
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325 <list type="tag">
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326 <tag-name><literal>var</literal></tag-name>
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327 <tag-desc>
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328 variable name.
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329 </tag-desc>
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330
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331 <tag-name><literal>value</literal></tag-name>
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332 <tag-desc>
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333 variable value.
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334 If an assigned value contains variables,
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335 their values are substituted.
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336 </tag-desc>
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337 </list>
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338
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339 </tag-desc>
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340
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341 </list>
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342 </para>
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343
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344 </section>
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345
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346
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347 <section id="variables" name="Embedded Variables">
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348
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349 <para>
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350 The <literal>ngx_http_ssi_module</literal> module supports
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351 two embedded variables:
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352 <list type="tag">
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353
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354 <tag-name><var>$date_local</var></tag-name>
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355 <tag-desc>
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356 current time in local time zone.
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357 The format is set by the <literal>config</literal> command
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358 with the <literal>timefmt</literal> parameter.
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359 </tag-desc>
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360
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361 <tag-name><var>$date_gmt</var></tag-name>
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362 <tag-desc>
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363 current time in GMT.
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364 The format is set by the <literal>config</literal> command
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365 with the <literal>timefmt</literal> parameter.
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366 </tag-desc>
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367
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368 </list>
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369 </para>
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370
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371 </section>
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372
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373 </module>