Mercurial > hg > nginx-site
annotate xml/cn/docs/http/ngx_http_rewrite_module.xml @ 1419:33e5af4c10d9
Typo fixed in the beginners guide.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 17 Feb 2015 13:45:51 +0300 |
parents | ceb8a4e374b7 |
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rev | line source |
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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="ngx_http_rewrite_module模块" |
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11 link="/cn/docs/http/ngx_http_rewrite_module.html" |
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12 lang="cn" |
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13 translator="cfsego" |
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14 rev="2"> |
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15 |
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16 <section id="summary"> |
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17 |
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18 <para> |
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19 <literal>ngx_http_rewrite_module</literal>模块允许正则替换URI,返回页面重定向,和按条件选择配置。 |
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20 </para> |
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21 |
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22 <para> |
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23 <literal>ngx_http_rewrite_module</literal>模块指令按以下顺序处理: |
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24 <list type="bullet"> |
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25 |
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26 <listitem> |
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27 处理在<link doc="ngx_http_core_module.xml" id="server"/>级别中定义的模块指令; |
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28 </listitem> |
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29 |
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30 <listitem> |
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31 为请求查找location; |
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32 </listitem> |
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33 |
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34 <listitem> |
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35 处理在选中的<link doc="ngx_http_core_module.xml" id="location"/>中定义的模块指令。如果指令改变了URI,按新的URI查找location。这个循环至多重复<link doc="ngx_http_core_module.xml" id="internal">10次</link>,之后nginx返回错误<http-status code="500" text="Internal Server Error"/>。 |
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36 </listitem> |
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37 |
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38 </list> |
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39 </para> |
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40 |
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41 </section> |
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42 |
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43 |
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44 <section id="directives" name="指令"> |
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45 |
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46 <directive name="break"> |
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47 <syntax/> |
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48 <default/> |
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49 <context>server</context> |
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50 <context>location</context> |
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51 <context>if</context> |
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52 |
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53 <para> |
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54 停止处理当前这一轮的<literal>ngx_http_rewrite_module</literal>指令集。 |
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55 </para> |
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56 |
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57 <para> |
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58 举例: |
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59 <example> |
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60 if ($slow) { |
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61 limit_rate 10k; |
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62 break; |
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63 } |
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64 </example> |
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65 </para> |
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66 |
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67 </directive> |
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68 |
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69 |
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70 <directive name="if"> |
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71 <syntax block="yes">(<value>condition</value>)</syntax> |
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72 <default/> |
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73 <context>server</context> |
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74 <context>location</context> |
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75 |
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76 <para> |
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77 计算指定的<value>condition</value>的值。如果为真,执行定义在大括号中的rewrite模块指令,并将<literal>if</literal>指令中的配置指定给请求。<literal>if</literal>指令会从上一层配置中继承配置。 |
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78 </para> |
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79 |
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80 <para> |
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81 条件可以是下列任意一种: |
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82 <list type="bullet"> |
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83 |
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84 <listitem> |
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85 变量名;如果变量值为空或者是以“<literal>0</literal>”开始的字符串,则条件为假; |
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86 </listitem> |
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87 |
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88 <listitem> |
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89 使用“<literal>=</literal>”和“<literal>!=</literal>”运算符比较变量和字符串; |
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90 </listitem> |
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91 |
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92 <listitem> |
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93 使用“<literal>~</literal>”(大小写敏感)和“<literal>~*</literal>”(大小写不敏感)运算符匹配变量和正则表达式。正则表达式可以包含匹配组,匹配结果后续可以使用变量<var>$1</var>..<var>$9</var>引用。如果正则表达式中包含字符“<literal>}</literal>”或者“<literal>;</literal>”,整个表达式应该被包含在单引号或双引号的引用中。 |
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94 </listitem> |
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95 |
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96 <listitem> |
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97 使用“<literal>-f</literal>”和“<literal>!-f</literal>”运算符检查文件是否存在; |
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98 </listitem> |
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99 |
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100 <listitem> |
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101 使用“<literal>-d</literal>”和“<literal>!-d</literal>”运算符检查目录是否存在; |
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102 </listitem> |
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103 |
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104 <listitem> |
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105 使用“<literal>-e</literal>”和“<literal>!-e</literal>”运算符检查文件、目录或符号链接是否存在; |
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106 </listitem> |
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107 |
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108 <listitem> |
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109 使用“<literal>-x</literal>”和“<literal>!-x</literal>”运算符检查可执行文件; |
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110 </listitem> |
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111 |
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112 </list> |
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113 </para> |
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114 |
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115 <para> |
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116 举例: |
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117 <example> |
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118 if ($http_user_agent ~ MSIE) { |
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119 rewrite ^(.*)$ /msie/$1 break; |
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120 } |
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121 |
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122 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { |
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123 set $id $1; |
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124 } |
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125 |
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126 if ($request_method = POST) { |
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127 return 405; |
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128 } |
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129 |
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130 if ($slow) { |
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131 limit_rate 10k; |
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132 } |
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133 |
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134 if ($invalid_referer) { |
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135 return 403; |
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136 } |
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137 </example> |
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138 <note> |
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139 内嵌变量<var>$invalid_referer</var>的值是通过<link doc="ngx_http_referer_module.xml" id="valid_referers"/>指令设置的。 |
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140 </note> |
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141 </para> |
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142 |
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143 </directive> |
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144 |
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145 |
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146 <directive name="return"> |
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147 <syntax><value>code</value> [<value>text</value>]</syntax> |
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148 <syntax><value>code</value> <value>URL</value></syntax> |
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149 <syntax><value>URL</value></syntax> |
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150 <default/> |
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151 <context>server</context> |
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152 <context>location</context> |
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153 <context>if</context> |
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154 |
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155 <para> |
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156 停止处理并返回指定<value>code</value>给客户端。返回非标准的状态码444可以直接关闭连接而不返回响应头。 |
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157 </para> |
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158 |
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159 <para> |
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160 从0.8.42版开始,可以在指令中指定重定向的URL(状态码为301、302、303和307),或者指定响应体<value>文本</value>(状态码为其它值)。响应体文本或重定向URL中可以包含变量。作为一种特殊情况,重定向URL可以简化为当前server的本地URI,那么完整的重定向URL将按照请求协议(<var>$scheme</var>)、<link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/>指令和<link doc="ngx_http_core_module.xml" id="port_in_redirect"/>指令的配置进行补全。 |
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161 </para> |
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162 |
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163 <para> |
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164 另外,状态码为302的临时重定向使用的<value>URL</value>可以作为指令的唯一参数。该参数应该以“<literal>http://</literal>”、“<literal>https://</literal>”或者“<literal>https://</literal>”开始。<value>URL</value>中可以包含变量。 |
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165 </para> |
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166 |
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167 <para> |
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168 <note> |
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169 0.7.51版本以前只能返回下面状态码: |
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170 204、400、402 — 406、408、410、411、413、416 和 500 — 504。 |
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171 </note> |
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172 |
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173 <note> |
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174 直到1.1.16和1.0.13版,状态码307才被认为是一种重定向。 |
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175 </note> |
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176 </para> |
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177 |
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178 </directive> |
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179 |
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180 |
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181 <directive name="rewrite"> |
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182 <syntax> |
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183 <value>regex</value> |
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184 <value>replacement</value> |
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185 [<value>flag</value>]</syntax> |
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186 <default/> |
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187 <context>server</context> |
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188 <context>location</context> |
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189 <context>if</context> |
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190 |
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191 <para> |
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192 如果指定的正则表达式能匹配URI,此URI将被<value>replacement</value>参数定义的字符串改写。<literal>rewrite</literal>指令按其在配置文件中出现的顺序执行。flag可以终止后续指令的执行。如果replacement的字符串以“<literal>http://</literal>”或“<literal>https://</literal>”开头,nginx将结束执行过程,并返回给客户端一个重定向。 |
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193 </para> |
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194 |
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195 <para> |
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196 可选的<value>flag</value>参数可以是其中之一: |
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197 <list type="tag"> |
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198 |
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199 <tag-name><literal>last</literal></tag-name> |
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200 <tag-desc> |
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201 停止执行当前这一轮的<literal>ngx_http_rewrite_module</literal>指令集,然后查找匹配改变后URI的新location; |
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202 </tag-desc> |
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203 |
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204 <tag-name><literal>break</literal></tag-name> |
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205 <tag-desc> |
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206 停止执行当前这一轮的<literal>ngx_http_rewrite_module</literal>指令集; |
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207 </tag-desc> |
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208 |
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209 <tag-name><literal>redirect</literal></tag-name> |
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210 <tag-desc> |
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211 在replacement字符串未以“<literal>http://</literal>”或“<literal>https://</literal>”开头时,使用返回状态码为302的临时重定向; |
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212 </tag-desc> |
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213 |
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214 <tag-name><literal>permanent</literal></tag-name> |
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215 <tag-desc> |
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216 返回状态码为301的永久重定向。 |
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217 </tag-desc> |
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218 |
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219 </list> |
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220 完整的重定向URL将按照请求协议(<var>$scheme</var>)、<link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/>指令和<link doc="ngx_http_core_module.xml" id="port_in_redirect"/>指令的配置进行补全。 |
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221 </para> |
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222 |
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223 <para> |
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224 举例: |
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225 <example> |
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226 server { |
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227 ... |
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228 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; |
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229 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; |
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230 return 403; |
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231 ... |
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232 } |
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233 </example> |
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234 </para> |
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235 |
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236 <para> |
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237 但是当上述指令写在“<literal>/download/</literal>”的location中时,应使用标志<literal>break</literal>代替<literal>last</literal>,否则nginx会重复10轮循环,然后返回错误500: |
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238 <example> |
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239 location /download/ { |
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240 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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241 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra break; |
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242 return 403; |
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243 } |
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244 </example> |
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245 </para> |
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246 |
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247 <para> |
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248 如果<value>replacement</value>字符串包括新的请求参数,以往的请求参数会添加到新参数后面。如果不希望这样,在replacement字符串末尾加一个问号“?”,就可以避免,比如: |
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249 <example> |
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250 rewrite ^/users/(.*)$ /show?user=$1? last; |
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251 </example> |
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252 </para> |
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253 |
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254 <para> |
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255 如果正则表达式中包含字符“<literal>}</literal>”或者“<literal>;</literal>”,整个表达式应该被包含在单引号或双引号的引用中。 |
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256 </para> |
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257 |
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258 </directive> |
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259 |
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260 |
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261 <directive name="rewrite_log"> |
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262 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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263 <default>off</default> |
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264 <context>http</context> |
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265 <context>server</context> |
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266 <context>location</context> |
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267 <context>if</context> |
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268 |
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269 <para> |
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270 开启或者关闭将<literal>ngx_http_rewrite_module</literal>模块指令的处理日志以<literal>notice</literal>级别记录到错误日志中。 |
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271 </para> |
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272 |
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273 </directive> |
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274 |
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275 |
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276 <directive name="set"> |
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277 <syntax><value>variable</value> <value>value</value></syntax> |
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278 <default/> |
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279 <context>server</context> |
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280 <context>location</context> |
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281 <context>if</context> |
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282 |
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283 <para> |
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284 为指定变量<value>variable</value>设置变量值<value>value</value>。<value>value</value>可以包含文本、变量或者它们的组合。 |
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285 </para> |
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286 |
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287 </directive> |
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288 |
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289 |
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290 <directive name="uninitialized_variable_warn"> |
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291 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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292 <default>on</default> |
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293 <context>http</context> |
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294 <context>server</context> |
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295 <context>location</context> |
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296 <context>if</context> |
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297 |
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298 <para> |
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299 控制是否记录变量未初始化的警告到日志。 |
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300 </para> |
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301 |
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302 </directive> |
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303 |
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304 </section> |
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305 |
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306 |
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307 <section id="internals" name="内部实现"> |
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308 |
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309 <para> |
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310 <literal>ngx_http_rewrite_module</literal>模块的指令在解析配置阶段被编译成nginx内部指令。这些内部指令在处理请求时被解释执行。而解释器是一个简单的堆栈机器。 |
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311 </para> |
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312 |
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313 <para> |
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314 比如,下面指令 |
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315 <example> |
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316 location /download/ { |
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317 if ($forbidden) { |
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318 return 403; |
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319 } |
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320 |
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321 if ($slow) { |
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322 limit_rate 10k; |
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323 } |
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324 |
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325 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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326 } |
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327 </example> |
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328 将被翻译成下面这些指令: |
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329 <example> |
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330 variable $forbidden |
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331 check against zero |
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332 return 403 |
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333 end of code |
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334 variable $slow |
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335 check against zero |
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336 match of regular expression |
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337 copy "/" |
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338 copy $1 |
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339 copy "/mp3/" |
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340 copy $2 |
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341 copy ".mp3" |
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342 end of regular expression |
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343 end of code |
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344 </example> |
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345 </para> |
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346 |
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347 <para> |
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348 请注意没有对应上面的<link doc="ngx_http_core_module.xml" id="limit_rate"/>指令的内部指令,因为这个指令与<literal>ngx_http_rewrite_module</literal>模块无关。nginx会为这个<link id="if"/>块单独创建一个配置,包含<literal>limit_rate</literal>等于10k。如果条件为真,nginx将把这个配置指派给请求。 |
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349 </para> |
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350 |
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351 <para> |
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352 指令 |
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353 <example> |
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354 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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355 </example> |
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356 可以通过将正则表达式中的第一个斜线“/”放入圆括号,来实现节约一个内部指令: |
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357 <example> |
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358 rewrite ^(<emphasis>/</emphasis>download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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359 </example> |
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360 对应的内部指令将会是这样: |
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361 <example> |
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362 match of regular expression |
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363 copy $1 |
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364 copy "/mp3/" |
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365 copy $2 |
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366 copy ".mp3" |
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367 end of regular expression |
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368 end of code |
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369 </example> |
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370 </para> |
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371 |
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372 </section> |
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373 |
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374 </module> |