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annotate xml/en/docs/http/ngx_http_perl_module.xml @ 2069:fc3ba2e76974
Documented size of keys_zone for commercial version (trac #1286).
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 26 Oct 2017 15:50:00 +0300 |
parents | c3f411040d24 |
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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) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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9 |
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10 <module name="Module ngx_http_perl_module" |
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11 link="/en/docs/http/ngx_http_perl_module.html" |
589 | 12 lang="en" |
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13 rev="6"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
966 | 18 The <literal>ngx_http_perl_module</literal> module is used to implement |
19 location and variable handlers in Perl and insert Perl calls into SSI. | |
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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, it should be enabled with the |
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24 <literal>--with-http_perl_module</literal> |
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25 configuration parameter. |
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26 <note> |
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27 This module requires |
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28 <link url="https://www.perl.org/get.html">Perl</link> version 5.6.1 or higher. |
966 | 29 The C compiler should be compatible with the one used to build Perl. |
416
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30 </note> |
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31 </para> |
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32 |
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33 </section> |
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34 |
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35 |
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36 <section id="issues" name="Known Issues"> |
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37 |
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38 <para> |
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39 The module is experimental, caveat emptor applies. |
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40 </para> |
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41 |
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42 <para> |
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43 In order for Perl to recompile the modified modules during |
966 | 44 reconfiguration, it should be built with the |
416
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45 <literal>-Dusemultiplicity=yes</literal> or |
966 | 46 <literal>-Dusethreads=yes</literal> parameters. |
47 Also, to make Perl leak less memory at run time, | |
48 it should be built with the | |
416
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49 <literal>-Dusemymalloc=no</literal> parameter. |
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50 To check the values of these parameters in an already built |
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51 Perl (preferred values are specified in the example), run: |
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52 <example> |
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53 $ perl -V:usemultiplicity -V:usemymalloc |
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54 usemultiplicity='define'; |
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55 usemymalloc='n'; |
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56 </example> |
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57 </para> |
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58 |
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59 <para> |
966 | 60 Note that after rebuilding Perl with the new |
416
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61 <literal>-Dusemultiplicity=yes</literal> or |
966 | 62 <literal>-Dusethreads=yes</literal> parameters, |
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63 all binary Perl modules will have to be rebuilt as well — |
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64 they will just stop working with the new Perl. |
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65 </para> |
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66 |
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67 <para> |
966 | 68 There is a possibility that the main process and then worker processes will |
69 grow in size after every reconfiguration. | |
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70 If the main process grows to an unacceptable size, the |
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71 <link doc="../control.xml" id="upgrade">live upgrade</link> |
966 | 72 procedure can be applied without changing the executable file. |
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73 </para> |
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74 |
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75 <para> |
966 | 76 While the Perl module is performing a long-running operation, such as |
77 resolving a domain name, connecting to another server, or querying a database, | |
78 other requests assigned to the current worker process will not be processed. | |
79 It is thus recommended to perform only such operations | |
80 that have predictable and short execution time, such as | |
81 accessing the local file system. | |
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82 </para> |
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83 |
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84 </section> |
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85 |
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86 |
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87 <section id="example" name="Example Configuration"> |
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88 |
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89 <para> |
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90 <example> |
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91 http { |
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92 |
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93 perl_modules perl/lib; |
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94 perl_require hello.pm; |
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95 |
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96 perl_set $msie6 ' |
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97 |
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98 sub { |
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99 my $r = shift; |
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100 my $ua = $r->header_in("User-Agent"); |
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101 |
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102 return "" if $ua =~ /Opera/; |
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103 return "1" if $ua =~ / MSIE [6-9]\.\d+/; |
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104 return ""; |
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105 } |
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106 |
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107 '; |
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108 |
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109 server { |
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110 location / { |
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111 perl hello::handler; |
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112 } |
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113 } |
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114 </example> |
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115 </para> |
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116 |
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117 <para> |
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118 The <path>perl/lib/hello.pm</path> module: |
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119 <example> |
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120 package hello; |
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121 |
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122 use nginx; |
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123 |
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124 sub handler { |
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125 my $r = shift; |
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126 |
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127 $r->send_http_header("text/html"); |
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128 return OK if $r->header_only; |
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129 |
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130 $r->print("hello!\n<br/>"); |
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131 |
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132 if (-f $r->filename or -d _) { |
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133 $r->print($r->uri, " exists!\n"); |
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134 } |
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135 |
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136 return OK; |
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137 } |
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138 |
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139 1; |
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140 __END__ |
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141 </example> |
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142 </para> |
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143 |
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144 </section> |
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145 |
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146 |
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147 <section id="directives" name="Directives"> |
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148 |
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149 <directive name="perl"> |
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150 <syntax><value>module</value>::<value>function</value>|'sub { ... }'</syntax> |
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151 <default/> |
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152 <context>location</context> |
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153 <context>limit_except</context> |
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154 |
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155 <para> |
966 | 156 Sets a Perl handler for the given location. |
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157 </para> |
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158 |
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159 </directive> |
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160 |
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161 |
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162 <directive name="perl_modules"> |
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163 <syntax><value>path</value></syntax> |
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164 <default/> |
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165 <context>http</context> |
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166 |
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167 <para> |
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168 Sets an additional path for Perl modules. |
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169 </para> |
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170 |
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171 </directive> |
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172 |
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173 |
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174 <directive name="perl_require"> |
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175 <syntax><value>module</value></syntax> |
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176 <default/> |
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177 <context>http</context> |
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178 |
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179 <para> |
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180 Defines the name of a module that will be loaded during each |
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181 reconfiguration. |
966 | 182 Several <literal>perl_require</literal> directives can be present. |
416
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183 </para> |
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184 |
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185 </directive> |
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186 |
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187 |
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188 <directive name="perl_set"> |
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189 <syntax> |
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190 <value>$variable</value> |
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191 <value>module</value>::<value>function</value>|'sub { ... }'</syntax> |
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192 <default/> |
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193 <context>http</context> |
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194 |
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195 <para> |
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196 Installs a Perl handler for the specified variable. |
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197 </para> |
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198 |
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199 </directive> |
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200 |
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201 </section> |
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202 |
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203 |
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204 <section id="ssi" name="Calling Perl from SSI"> |
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205 |
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206 <para> |
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207 An SSI command calling Perl has the following format: |
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208 <example> |
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209 <!--# perl sub="<value>module</value>::<value>function</value>" arg="<value>parameter1</value>" arg="<value>parameter2</value>" ... |
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210 --> |
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211 </example> |
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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 |
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217 <section id="methods" name="The $r Request Object Methods"> |
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218 |
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219 <para> |
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220 <list type="tag"> |
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221 |
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222 <tag-name><literal>$r->args</literal></tag-name> |
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223 <tag-desc> |
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224 returns request arguments. |
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225 </tag-desc> |
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226 |
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227 <tag-name><literal>$r->filename</literal></tag-name> |
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228 <tag-desc> |
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229 returns a filename corresponding to the request URI. |
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230 </tag-desc> |
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231 |
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232 <tag-name> |
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233 <literal>$r->has_request_body(<value>handler</value>)</literal> |
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234 </tag-name> |
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235 <tag-desc> |
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236 returns 0 if there is no body in a request. |
966 | 237 If there is a body, the specified handler is set for the request |
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238 and 1 is returned. |
966 | 239 After reading the request body, nginx will call the specified handler. |
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240 Note that the handler function should be passed by reference. |
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241 Example: |
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242 <example> |
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243 package hello; |
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244 |
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245 use nginx; |
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246 |
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247 sub handler { |
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248 my $r = shift; |
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249 |
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250 if ($r->request_method ne "POST") { |
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251 return DECLINED; |
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252 } |
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253 |
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254 if ($r->has_request_body(<emphasis>\&post</emphasis>)) { |
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255 return OK; |
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256 } |
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257 |
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258 return HTTP_BAD_REQUEST; |
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259 } |
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260 |
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261 sub <emphasis>post</emphasis> { |
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262 my $r = shift; |
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263 |
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264 $r->send_http_header; |
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265 |
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266 $r->print("request_body: \"", $r->request_body, "\"<br/>"); |
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267 $r->print("request_body_file: \"", $r->request_body_file, "\"<br/>\n"); |
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268 |
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269 return OK; |
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270 } |
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271 |
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272 1; |
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273 |
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274 __END__ |
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275 </example> |
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276 </tag-desc> |
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277 |
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278 <tag-name><literal>$r->allow_ranges</literal></tag-name> |
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279 <tag-desc> |
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280 enables the use of byte ranges when sending responses. |
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281 </tag-desc> |
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282 |
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283 <tag-name><literal>$r->discard_request_body</literal></tag-name> |
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284 <tag-desc> |
966 | 285 instructs nginx to discard the request body. |
416
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286 </tag-desc> |
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287 |
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288 <tag-name><literal>$r->header_in(<value>field</value>)</literal></tag-name> |
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289 <tag-desc> |
966 | 290 returns the value of the specified client request header field. |
416
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291 </tag-desc> |
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292 |
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293 <tag-name><literal>$r->header_only</literal></tag-name> |
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294 <tag-desc> |
966 | 295 determines whether the whole response or only its header should be sent to |
296 the client. | |
416
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297 </tag-desc> |
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298 |
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299 <tag-name> |
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300 <literal>$r->header_out(<value>field</value>, |
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301 <value>value</value>)</literal> |
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302 </tag-name> |
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303 <tag-desc> |
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304 sets a value for the specified response header field. |
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305 </tag-desc> |
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306 |
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307 <tag-name> |
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308 <literal>$r->internal_redirect(<value>uri</value>)</literal> |
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309 </tag-name> |
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310 <tag-desc> |
747 | 311 does an internal redirect to the specified <value>uri</value>. |
966 | 312 An actual redirect happens after the Perl handler execution is completed. |
760
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313 <note> |
966 | 314 Redirections to named locations are currently not supported. |
760
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315 </note> |
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316 </tag-desc> |
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317 |
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318 <tag-name><literal>$r->log_error(<value>errno</value>, |
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319 <value>message</value>)</literal></tag-name> |
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320 <tag-desc> |
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321 writes the specified <value>message</value> into the |
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322 <link doc="../ngx_core_module.xml" id="error_log"/>. |
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323 If <value>errno</value> is non-zero, an error code and its description |
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324 will be appended to the message. |
416
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325 </tag-desc> |
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326 |
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327 <tag-name><literal>$r->print(<value>text</value>, ...)</literal></tag-name> |
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328 <tag-desc> |
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329 passes data to a client. |
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330 </tag-desc> |
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331 |
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332 <tag-name><literal>$r->request_body</literal></tag-name> |
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333 <tag-desc> |
966 | 334 returns the client request body if it has not been |
416
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335 written to a temporary file. |
966 | 336 To ensure that the client request body is in memory, |
337 its size should be limited by | |
416
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338 <link doc="ngx_http_core_module.xml" id="client_max_body_size"/>, |
966 | 339 and a sufficient buffer size should be set using |
416
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340 <link doc="ngx_http_core_module.xml" id="client_body_buffer_size"/>. |
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341 </tag-desc> |
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342 |
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343 <tag-name><literal>$r->request_body_file</literal></tag-name> |
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344 <tag-desc> |
966 | 345 returns the name of the file with the client request body. |
346 After the processing, the file should be removed. | |
416
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347 To always write a request body to a file, |
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348 <link doc="ngx_http_core_module.xml" id="client_body_in_file_only"/> |
966 | 349 should be enabled. |
416
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350 </tag-desc> |
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351 |
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352 <tag-name><literal>$r->request_method</literal></tag-name> |
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353 <tag-desc> |
966 | 354 returns the client request HTTP method. |
416
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355 </tag-desc> |
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356 |
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357 <tag-name><literal>$r->remote_addr</literal></tag-name> |
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358 <tag-desc> |
966 | 359 returns the client IP address. |
416
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360 </tag-desc> |
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361 |
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362 <tag-name><literal>$r->flush</literal></tag-name> |
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363 <tag-desc> |
966 | 364 immediately sends data to the client. |
416
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365 </tag-desc> |
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366 |
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367 <tag-name> |
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368 <literal>$r->sendfile(<value>name</value>[, |
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369 <value>offset</value>[, |
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370 <value>length</value>]])</literal> |
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371 </tag-name> |
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372 <tag-desc> |
966 | 373 sends the specified file content to the client. |
416
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374 Optional parameters |
966 | 375 specify the initial offset and length of the data to be transmitted. |
416
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376 The actual data transmission happens after the Perl handler |
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377 has completed. |
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378 </tag-desc> |
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379 |
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380 <tag-name> |
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381 <literal>$r->send_http_header([<value>type</value>])</literal> |
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382 </tag-name> |
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383 <tag-desc> |
966 | 384 sends the response header to the client. |
385 The optional <value>type</value> parameter sets the value of | |
416
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386 the <header>Content-Type</header> response header field. |
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387 If the value is an empty string, the <header>Content-Type</header> |
966 | 388 header field will not be sent. |
416
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389 </tag-desc> |
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390 |
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391 <tag-name><literal>$r->status(<value>code</value>)</literal></tag-name> |
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392 <tag-desc> |
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393 sets a response code. |
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394 </tag-desc> |
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395 |
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396 <tag-name> |
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397 <literal>$r->sleep(<value>milliseconds</value>, |
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398 <value>handler</value>)</literal> |
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399 </tag-name> |
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400 <tag-desc> |
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401 sets the specified handler |
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402 and stops request processing for the specified time. |
1146
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Corrected spelling in the "in the meantime" phrase.
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403 In the meantime, nginx continues to process other requests. |
416
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404 After the specified time has elapsed, nginx will call the installed handler. |
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English translation of ngx_http_perl_module.
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405 Note that the handler function should be passed by reference. |
c9c0550465c9
English translation of ngx_http_perl_module.
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406 In order to pass data between handlers, |
c9c0550465c9
English translation of ngx_http_perl_module.
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407 <literal>$r->variable()</literal> should be used. |
c9c0550465c9
English translation of ngx_http_perl_module.
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408 Example: |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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409 <example> |
c9c0550465c9
English translation of ngx_http_perl_module.
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410 package hello; |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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411 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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412 use nginx; |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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413 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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414 sub handler { |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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415 my $r = shift; |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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416 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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417 $r->discard_request_body; |
c9c0550465c9
English translation of ngx_http_perl_module.
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418 $r->variable("var", "OK"); |
c9c0550465c9
English translation of ngx_http_perl_module.
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419 $r->sleep(1000, <emphasis>\&next</emphasis>); |
c9c0550465c9
English translation of ngx_http_perl_module.
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420 |
c9c0550465c9
English translation of ngx_http_perl_module.
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421 return OK; |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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422 } |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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423 |
c9c0550465c9
English translation of ngx_http_perl_module.
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424 sub <emphasis>next</emphasis> { |
c9c0550465c9
English translation of ngx_http_perl_module.
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425 my $r = shift; |
c9c0550465c9
English translation of ngx_http_perl_module.
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426 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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427 $r->send_http_header; |
c9c0550465c9
English translation of ngx_http_perl_module.
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428 $r->print($r->variable("var")); |
c9c0550465c9
English translation of ngx_http_perl_module.
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429 |
c9c0550465c9
English translation of ngx_http_perl_module.
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430 return OK; |
c9c0550465c9
English translation of ngx_http_perl_module.
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431 } |
c9c0550465c9
English translation of ngx_http_perl_module.
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432 |
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English translation of ngx_http_perl_module.
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433 1; |
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English translation of ngx_http_perl_module.
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434 |
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English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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435 __END__ |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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436 </example> |
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English translation of ngx_http_perl_module.
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437 </tag-desc> |
c9c0550465c9
English translation of ngx_http_perl_module.
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438 |
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English translation of ngx_http_perl_module.
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439 <tag-name><literal>$r->unescape(<value>text</value>)</literal></tag-name> |
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English translation of ngx_http_perl_module.
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440 <tag-desc> |
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English translation of ngx_http_perl_module.
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441 decodes a text encoded in the “%XX” form. |
c9c0550465c9
English translation of ngx_http_perl_module.
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442 </tag-desc> |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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443 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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444 <tag-name><literal>$r->uri</literal></tag-name> |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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445 <tag-desc> |
c9c0550465c9
English translation of ngx_http_perl_module.
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446 returns a request URI. |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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447 </tag-desc> |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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448 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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449 <tag-name> |
c9c0550465c9
English translation of ngx_http_perl_module.
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450 <literal>$r->variable(<value>name</value>[, |
c9c0550465c9
English translation of ngx_http_perl_module.
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451 <value>value</value>])</literal> |
c9c0550465c9
English translation of ngx_http_perl_module.
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452 </tag-name> |
c9c0550465c9
English translation of ngx_http_perl_module.
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453 <tag-desc> |
966 | 454 returns or sets the value of the specified variable. |
416
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English translation of ngx_http_perl_module.
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455 Variables are local to each request. |
c9c0550465c9
English translation of ngx_http_perl_module.
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456 </tag-desc> |
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English translation of ngx_http_perl_module.
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457 |
c9c0550465c9
English translation of ngx_http_perl_module.
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458 </list> |
c9c0550465c9
English translation of ngx_http_perl_module.
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459 </para> |
c9c0550465c9
English translation of ngx_http_perl_module.
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460 |
c9c0550465c9
English translation of ngx_http_perl_module.
Ruslan Ermilov <ru@nginx.com>
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461 </section> |
c9c0550465c9
English translation of ngx_http_perl_module.
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462 |
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English translation of ngx_http_perl_module.
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463 </module> |