Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_rewrite_module.xml @ 614:0526cac4637e
Removed intimate details of the "debug_connection" directive's
behavior that is soon to be changed again.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 31 Jul 2012 13:24:43 +0000 |
parents | 764fbac1b8b4 |
children | f2d8603813b0 |
rev | line source |
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392
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1 <?xml version="1.0"?> |
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2 |
580
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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_rewrite_module" |
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11 link="/en/docs/http/ngx_http_rewrite_module.html" |
589 | 12 lang="en" |
13 rev="1"> | |
392
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
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18 The <literal>ngx_http_rewrite_module</literal> module allows to |
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19 change URIs using regular expressions, return redirects, and |
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20 conditionally select configurations. |
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21 </para> |
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22 |
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23 <para> |
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24 The <literal>ngx_http_rewrite_module</literal> module directives are |
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25 processed in the following order: |
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26 <list type="bullet"> |
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27 |
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28 <listitem> |
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29 the directives of this module specified on the |
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30 <link doc="ngx_http_core_module.xml" id="server"/> level are processed; |
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31 </listitem> |
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32 |
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33 <listitem> |
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34 a location for a request is searched; |
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35 </listitem> |
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36 |
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37 <listitem> |
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38 the directives of this module specified in the selected |
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39 <link doc="ngx_http_core_module.xml" id="location"/> are processed, |
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40 and if they changed a URI, a new location is searched for the new URI. |
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41 This cycle may be repeated up to 10 times after which the error |
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42 <http-status code="500" text="Internal Server Error"/> is returned. |
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43 </listitem> |
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44 |
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45 </list> |
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46 </para> |
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47 |
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48 </section> |
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49 |
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50 |
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51 <section id="directives" name="Directives"> |
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52 |
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53 <directive name="break"> |
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54 <syntax/> |
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55 <default/> |
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56 <context>server</context> |
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57 <context>location</context> |
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58 <context>if</context> |
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59 |
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60 <para> |
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61 Stops processing the current set of |
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62 <literal>ngx_http_rewrite_module</literal> directives. |
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63 </para> |
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64 |
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65 <para> |
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66 Example: |
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67 <example> |
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68 if ($slow) { |
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69 limit_rate 10k; |
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70 break; |
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71 } |
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72 </example> |
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73 </para> |
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74 |
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75 </directive> |
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76 |
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77 |
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78 <directive name="if"> |
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79 <syntax block="yes">(<value>condition</value>)</syntax> |
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80 <default/> |
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81 <context>server</context> |
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82 <context>location</context> |
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83 |
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84 <para> |
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85 The specified <value>condition</value> is evaluated. |
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86 If true, the directives of this module specified inside the braces are |
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87 executed, and a request is assigned the configuration inside the |
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88 <literal>if</literal> directive. |
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89 Configurations inside the <literal>if</literal> directives are |
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90 inherited from the previous configuration level. |
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91 </para> |
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92 |
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93 <para> |
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94 A condition may be any of the following: |
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95 <list type="bullet"> |
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96 |
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97 <listitem> |
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98 a variable name; false if the value of a variable is an empty string |
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99 or any string starting with “<literal>0</literal>”; |
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100 </listitem> |
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101 |
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102 <listitem> |
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103 comparing a variable with a string using the |
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104 “<literal>=</literal>” and “<literal>!=</literal>” operators; |
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105 </listitem> |
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106 |
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107 <listitem> |
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108 matching a variable against a regular expression using the |
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109 “<literal>~</literal>” (for case-sensitive matching) and |
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110 “<literal>~*</literal>” (for case-insensitive matching) operators. |
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111 Regular expressions can contain captures that are made available for |
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112 later reuse in the <var>$1</var>..<var>$9</var> variables. |
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113 Negative operators “<literal>!~</literal>” and “<literal>!~*</literal>” |
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114 are also available. |
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115 If a regular expression includes the characters “<literal>}</literal>” |
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116 or “<literal>;</literal>”, the whole expressions should be enclosed |
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117 in single or double quotes. |
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118 </listitem> |
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119 |
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120 <listitem> |
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121 checking a file existence with the “<literal>-f</literal>” and |
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122 “<literal>!-f</literal>” operators; |
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123 </listitem> |
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124 |
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125 <listitem> |
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126 checking a directory existence with the “<literal>-d</literal>” and |
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127 “<literal>!-d</literal>” operators; |
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128 </listitem> |
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129 |
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130 <listitem> |
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131 checking a file, directory, or symbolic link existence with the |
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132 “<literal>-e</literal>” and “<literal>!-e</literal>” operators; |
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133 </listitem> |
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134 |
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135 <listitem> |
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136 checking for an executable file with operators “<literal>-x</literal>” |
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137 and “<literal>!-x</literal>” operators. |
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138 </listitem> |
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139 |
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140 </list> |
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141 </para> |
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142 |
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143 <para> |
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144 Examples: |
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145 <example> |
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146 if ($http_user_agent ~ MSIE) { |
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147 rewrite ^(.*)$ /msie/$1 break; |
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148 } |
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149 |
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150 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { |
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151 set $id $1; |
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152 } |
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153 |
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154 if ($request_method = POST) { |
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155 return 405; |
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156 } |
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157 |
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158 if ($slow) { |
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159 limit_rate 10k; |
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160 } |
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161 |
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162 if ($invalid_referer) { |
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163 return 403; |
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164 } |
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165 </example> |
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166 <note> |
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167 A value of the embedded variable <var>$invalid_referer</var> is set by the |
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168 <link doc="ngx_http_referer_module.xml" id="valid_referers"/> directive. |
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169 </note> |
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170 </para> |
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171 |
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172 </directive> |
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173 |
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174 |
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175 <directive name="return"> |
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176 <syntax><value>code</value> [<value>text</value>]</syntax> |
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177 <syntax><value>code</value> <value>URL</value></syntax> |
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178 <syntax><value>URL</value></syntax> |
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179 <default/> |
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180 <context>server</context> |
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181 <context>location</context> |
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182 <context>if</context> |
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183 |
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184 <para> |
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185 Stops processing and returns the specified <value>code</value> to a client. |
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186 The non-standard code 444 closes a connection without sending |
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187 a response header. |
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188 </para> |
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189 |
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190 <para> |
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191 Starting from version 0.8.42, it is possible to specify |
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192 either the URL of redirect (for codes 301, 302, 303, and 307), |
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193 or the <value>text</value> of a response body (for other codes). |
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194 A response body text or URL of redirect can contain variables. |
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195 As a special case, a URL of redirect can be specified as a URI |
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196 local to this server, in which case the full URL of redirect |
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197 is formed according to the request scheme (<var>$scheme</var>) and the |
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198 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> and |
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199 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/> directives. |
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200 </para> |
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201 |
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202 <para> |
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203 In addition, a <value>URL</value> for temporary redirect with the code 302 |
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204 can be specified as the sole parameter. |
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205 Such a parameter should start with the string “<literal>http://</literal>”, |
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206 “<literal>https://</literal>”, or “<literal>$scheme</literal>”. |
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207 A <value>URL</value> can contain variables. |
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208 </para> |
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209 |
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210 <para> |
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211 <note> |
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212 Only the following codes could be returned before version 0.7.51: |
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213 204, 400, 402 — 406, 408, 410, 411, 413, 416, and 500 — 504. |
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214 </note> |
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215 |
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216 <note> |
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217 The code 307 was not treated as a redirect until versions 1.1.16 and 1.0.13. |
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218 </note> |
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219 </para> |
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220 |
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221 </directive> |
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222 |
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223 |
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224 <directive name="rewrite"> |
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225 <syntax> |
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226 <value>regex</value> |
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227 <value>replacement</value> |
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228 [<value>flag</value>]</syntax> |
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229 <default/> |
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230 <context>server</context> |
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231 <context>location</context> |
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232 <context>if</context> |
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233 |
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234 <para> |
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235 If the specified regular expression matches a URI, the URI is changed |
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236 as specified in the <value>replacement</value> string. |
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237 The <literal>rewrite</literal> directives are executed sequentially |
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238 in order of their appearance in the configuration file. |
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239 Flags make it possible to terminate further processing of directives. |
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240 If a replacement string starts with “<literal>http://</literal>” |
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241 or “<literal>https://</literal>”, the processing stops and a |
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242 redirect is returned to a client. |
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243 </para> |
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244 |
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245 <para> |
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246 An optional <value>flag</value> parameter can be one of: |
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247 <list type="tag"> |
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248 |
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249 <tag-name><literal>last</literal></tag-name> |
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250 <tag-desc> |
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251 stops processing the current set of |
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252 <literal>ngx_http_rewrite_module</literal> directives |
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253 followed by a search for a new location matching the changed URI; |
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254 </tag-desc> |
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255 |
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256 <tag-name><literal>break</literal></tag-name> |
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257 <tag-desc> |
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258 stops processing the current set of |
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259 <literal>ngx_http_rewrite_module</literal> directives; |
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260 </tag-desc> |
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261 |
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262 <tag-name><literal>redirect</literal></tag-name> |
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263 <tag-desc> |
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264 returns a temporary redirect with the code 302; |
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265 used if a replacement string does not start with |
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266 “<literal>http://</literal>” or “<literal>https://</literal>”; |
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267 </tag-desc> |
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268 |
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269 <tag-name><literal>permanent</literal></tag-name> |
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270 <tag-desc> |
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271 returns a permanent redirect with the code 301. |
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272 </tag-desc> |
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273 |
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274 </list> |
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275 The full URL of redirects is formed according to the |
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276 request scheme (<var>$scheme</var>) and the |
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277 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> and |
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278 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/> directives. |
392
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279 </para> |
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280 |
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281 <para> |
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282 Example: |
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283 <example> |
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284 server { |
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285 ... |
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286 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; |
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287 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; |
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288 return 403; |
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289 ... |
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290 } |
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291 </example> |
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292 </para> |
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293 |
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294 <para> |
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295 But if these directives are put inside the “<literal>/download/</literal>” |
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296 location, the <literal>last</literal> flag should be replaced by |
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297 <literal>break</literal>, otherwise nginx will make 10 cycles and |
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298 return the error 500: |
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299 <example> |
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300 location /download/ { |
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301 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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302 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra break; |
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303 return 403; |
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304 } |
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305 </example> |
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306 </para> |
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307 |
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308 <para> |
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309 If a <value>replacement</value> string includes the new request arguments, |
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310 the previous request arguments are appended after them. |
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311 If this is undesired, putting a question mark at the end of a replacement |
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312 string avoids having them appended, for example: |
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313 <example> |
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314 rewrite ^/users/(.*)$ /show?user=$1? last; |
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315 </example> |
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316 </para> |
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317 |
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318 <para> |
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319 If a regular expression includes the characters “<literal>}</literal>” |
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320 or “<literal>;</literal>”, the whole expressions should be enclosed |
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321 in single or double quotes. |
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322 </para> |
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323 |
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324 </directive> |
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325 |
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326 |
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327 <directive name="set"> |
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328 <syntax><value>variable</value> <value>value</value></syntax> |
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329 <default/> |
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330 <context>server</context> |
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331 <context>location</context> |
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332 <context>if</context> |
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333 |
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334 <para> |
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335 Sets a <value>value</value> for the specified <value>variable</value>. |
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336 A <value>value</value> can contain text, variables, and their combination. |
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337 </para> |
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338 |
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339 </directive> |
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340 |
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341 |
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342 <directive name="uninitialized_variable_warn"> |
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343 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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344 <default>on</default> |
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345 <context>http</context> |
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346 <context>server</context> |
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347 <context>location</context> |
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348 <context>if</context> |
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349 |
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350 <para> |
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351 Controls whether warnings about uninitialized variables are logged. |
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352 </para> |
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353 |
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354 </directive> |
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355 |
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356 </section> |
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357 |
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358 |
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359 <section id="internals" name="Internal Implementation"> |
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360 |
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361 <para> |
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362 The <literal>ngx_http_rewrite_module</literal> module directives |
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363 are compiled during the configuration stage into internal instructions |
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364 that are interpreted during request processing. |
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365 An interpreter is a simple virtual stack machine. |
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366 </para> |
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367 |
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368 <para> |
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369 For example, the directives |
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370 <example> |
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371 location /download/ { |
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372 if ($forbidden) { |
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373 return 403; |
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374 } |
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375 |
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376 if ($slow) { |
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377 limit_rate 10k; |
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378 } |
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379 |
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380 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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381 } |
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382 </example> |
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383 will be translated into these instructions: |
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384 <example> |
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385 variable $forbidden |
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386 check against zero |
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387 return 403 |
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388 end of code |
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389 variable $slow |
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390 check against zero |
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391 match of regular expression |
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392 copy "/" |
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393 copy $1 |
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394 copy "/mp3/" |
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395 copy $2 |
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396 copy ".mp3" |
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397 end of regular expression |
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398 end of code |
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399 </example> |
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400 </para> |
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401 |
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402 <para> |
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403 Note that there are no instructions for the |
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404 <link doc="ngx_http_core_module.xml" id="limit_rate"/> |
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405 directive above as it is unrelated to the |
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406 <literal>ngx_http_rewrite_module</literal> module. |
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407 A separate configuration is created for the <link id="if"/> block. |
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408 If the condition holds true, a request is assigned this configuration |
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409 where <literal>limit_rate</literal> equals to 10k. |
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410 </para> |
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411 |
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412 <para> |
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413 The directive |
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414 <example> |
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415 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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416 </example> |
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417 can be made smaller by one instruction if the first slash in the regular expression |
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418 is put inside the parentheses: |
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419 <example> |
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420 rewrite ^(<emphasis>/</emphasis>download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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421 </example> |
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422 The corresponding instructions will then look like this: |
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423 <example> |
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424 match of regular expression |
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425 copy $1 |
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426 copy "/mp3/" |
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427 copy $2 |
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428 copy ".mp3" |
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429 end of regular expression |
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430 end of code |
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431 </example> |
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432 </para> |
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433 |
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434 </section> |
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435 |
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436 </module> |