Mercurial > hg > nginx-site
annotate xml/ru/docs/http/request_processing.xml @ 522:ef11546f75ee
Translated "request_processing" into Russian, removed "virtual_hosts"
(which was a partly obsolete subset of "request_processing"), added
Russian introduction.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 24 May 2012 12:39:04 +0000 |
parents | |
children | be54c443235a |
rev | line source |
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522
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1 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> |
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2 |
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3 <article name="Как nginx обрабатывает запросы" |
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4 link="/ru/docs/http/request_processing.html" |
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5 lang="ru" |
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6 author="Игорь Сысоев" |
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7 editor="Brian Mercer"> |
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8 |
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9 <section name="Определение виртуального сервера по имени"> |
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10 |
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11 <para> |
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12 nginx вначале решает, какой из серверов должен обработать запрос. |
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13 Рассмотрим простую конфигурацию, |
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14 где все три виртуальных сервера слушают на порту *:80: |
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15 <programlisting> |
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16 server { |
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17 listen 80; |
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18 server_name example.org www.example.org; |
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19 ... |
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20 } |
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21 |
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22 server { |
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23 listen 80; |
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24 server_name example.net www.example.net; |
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25 ... |
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26 } |
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27 |
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28 server { |
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29 listen 80; |
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30 server_name example.com www.example.com; |
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31 ... |
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32 } |
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33 </programlisting> |
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34 |
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35 </para> |
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36 |
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37 <para> |
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38 В этой конфигурации, чтобы определить, какому серверу следует направить |
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39 запрос, nginx проверяет только поле <header>Host</header> заголовка запроса. |
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40 Если его значение не соответствует ни одному из имён серверов |
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41 или в заголовке запроса нет этого поля вовсе, |
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42 nginx направит запрос в сервер по умолчанию для этого порта. |
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43 В вышеприведённой конфигурации сервером по умолчанию будет первый сервер, |
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44 что соответствует стандартному поведению nginx по умолчанию. |
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45 Сервер по умолчанию можно задать явно с помощью параметра |
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46 <literal>default_server</literal> в директиве |
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47 <link doc="ngx_http_core_module.xml" id="listen"/>: |
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48 <programlisting> |
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49 server { |
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50 listen 80 <b>default_server</b>; |
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51 server_name example.net www.example.net; |
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52 ... |
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53 } |
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54 </programlisting> |
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55 |
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56 <note> |
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57 Параметр <literal>default_server</literal> появился в |
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58 версии 0.8.21. |
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59 В более ранних версиях вместо него следует использовать параметр |
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60 <literal>default</literal>. |
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61 </note> |
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62 Следует иметь в виду, что сервер по умолчанию является свойством |
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63 слушающего порта, а не имени сервера. |
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64 Подробнее это обсуждается ниже. |
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65 </para> |
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66 |
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67 </section> |
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68 |
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69 |
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70 <section id="how_to_prevent_undefined_server_names" |
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71 name="Как предотвратить обработку запросов без имени сервера"> |
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72 |
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73 <para> |
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74 Если запросы без поля <header>Host</header> в заголовке не должны |
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75 обрабатываться, можно определить сервер, который будет их отклонять: |
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76 <programlisting> |
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77 server { |
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78 listen 80; |
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79 server_name ""; |
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80 return 444; |
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81 } |
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82 </programlisting> |
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83 Здесь в качестве имени сервера указана пустая строка, которая |
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84 соответствует запросам без поля <header>Host</header> в заголовке, |
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85 и возвращается специальный для nginx код 444, который закрывает |
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86 соединение. |
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87 <note> |
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88 Начиная с версии 0.8.48 настройка <literal>server_name ""</literal> |
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89 является стандартной и может явно не указываться. |
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90 В более ранних версиях в качестве стандартного имени сервера |
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91 выступало имя машины (hostname). |
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92 </note> |
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93 </para> |
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94 |
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95 </section> |
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96 |
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97 |
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98 <section id="mixed_name_ip_based_servers" |
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99 name="Определение виртуального сервера по имени и IP-адресу"> |
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100 |
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101 <para> |
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102 Рассмотрим более сложную конфигурацию, |
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103 в которой некоторые виртуальные серверы слушают на разных адресах: |
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104 <programlisting> |
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105 server { |
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106 listen 192.168.1.1:80; |
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107 server_name example.org www.example.org; |
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108 ... |
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109 } |
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110 |
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111 server { |
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112 listen 192.168.1.1:80; |
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113 server_name example.net www.example.net; |
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114 ... |
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115 } |
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116 |
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117 server { |
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118 listen 192.168.1.2:80; |
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119 server_name example.com www.example.com; |
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120 ... |
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121 } |
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122 </programlisting> |
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123 В этой конфигурации nginx вначале сопоставляет IP-адрес и порт |
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124 запроса с директивами |
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125 <link doc="ngx_http_core_module.xml" id="listen"/> |
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126 в блоках |
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127 <link doc="ngx_http_core_module.xml" id="server"/>. |
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128 Затем он сопоставляет значение поля <header>Host</header> |
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129 заголовка запроса с директивами |
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130 <link doc="ngx_http_core_module.xml" id="server_name"/> |
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131 в блоках |
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132 <link doc="ngx_http_core_module.xml" id="server"/>, |
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133 которые соответствуют IP-адресу и порту. |
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134 Если имя сервера не найдено, запрос будет обработан в |
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135 сервере по умолчанию. |
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136 Например, запрос <url>www.example.com</url>, пришедший на порт |
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137 192.168.1.1:80, будет обработан сервером по умолчанию для порта |
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138 192.168.1.1:80, т.е. первым сервером, т.к. для этого порта |
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139 <url>www.example.com</url> не указан в списке имён серверов. |
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140 </para> |
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141 |
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142 <para> |
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143 Как уже говорилось, сервер по умолчанию является свойством слушающего порта, |
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144 поэтому у разных портов могут быть определены свои серверы по умолчанию: |
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145 <programlisting> |
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146 server { |
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147 listen 192.168.1.1:80; |
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148 server_name example.org www.example.org; |
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149 ... |
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150 } |
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151 |
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152 server { |
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153 listen 192.168.1.1:80 <b>default_server</b>; |
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154 server_name example.net www.example.net; |
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155 ... |
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156 } |
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157 |
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158 server { |
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159 listen 192.168.1.2:80 <b>default_server</b>; |
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160 server_name example.com www.example.com; |
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161 ... |
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162 } |
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163 </programlisting> |
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164 |
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165 </para> |
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166 |
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167 </section> |
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168 |
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169 |
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170 <section id="simple_php_site_configuration" |
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171 name="Конфигурация простого сайта PHP"> |
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172 |
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173 <para> |
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174 Теперь посмотрим на то, как nginx выбирает <i>location</i> |
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175 для обработки запроса на примере обычного простого PHP-сайта: |
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176 <programlisting> |
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177 server { |
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178 listen 80; |
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179 server_name example.org www.example.org; |
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180 root /data/www; |
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181 |
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182 location / { |
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183 index index.html index.php; |
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184 } |
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185 |
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186 location ~* \.(gif|jpg|png)$ { |
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187 expires 30d; |
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188 } |
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189 |
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190 location ~ \.php$ { |
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191 fastcgi_pass localhost:9000; |
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192 fastcgi_param SCRIPT_FILENAME |
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193 $document_root$fastcgi_script_name; |
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194 include fastcgi_params; |
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195 } |
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196 } |
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197 </programlisting> |
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198 |
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199 </para> |
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200 |
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201 <para> |
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202 nginx вначале ищет среди всех префиксных location’ов, заданных строками, |
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203 максимально совпадающий. |
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204 В вышеприведённой конфигурации |
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205 указан только один префиксный location “<literal>/</literal>”, и поскольку |
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206 он подходит под любой запрос, он и будет использован, если других |
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207 совпадений не будет найдено. |
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208 Затем nginx проверяет location’ы, заданные регулярными выражениями, в |
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209 порядке их следования в конфигурационном файле. |
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210 При первом же совпадении поиск прекращается и nginx использует |
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211 совпавший location. |
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212 Если запросу не соответствует ни одно из регулярных выражений, |
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213 nginx использует максимально совпавший префиксный location, |
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214 найденный ранее. |
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215 </para> |
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216 |
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217 <para> |
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218 Следует иметь в виду, что location’ы всех типов сопоставляются только с |
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219 URI-частью строки запроса без аргументов. |
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220 Так делается потому, что аргументы в строке запроса могут быть |
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221 заданы различными способами, например: |
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222 <programlisting> |
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223 /index.php?user=john&page=1 |
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224 /index.php?page=1&user=john |
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225 </programlisting> |
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226 Кроме того, в строке запроса можно запросить что угодно: |
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227 <programlisting> |
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228 /index.php?page=1&something+else&user=john |
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229 </programlisting> |
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230 |
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231 </para> |
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232 |
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233 <para> |
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234 Теперь посмотрим, как бы обрабатывались запросы |
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235 в вышеприведённой конфигурации: |
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236 <list type="bullet" compact="no"> |
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237 |
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238 <listitem> |
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239 Запросу “<literal>/logo.gif</literal>” во-первых соответствует префиксный |
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240 location “<literal>/</literal>”, а во-вторых—регулярное выражение |
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241 “<literal>\.(gif|jpg|png)$</literal>”, |
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242 поэтому он обрабатывается location’ом регулярного выражения. |
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243 Согласно директиве “<literal>root /data/www</literal>” запрос |
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244 отображается в файл <path>/data/www/logo.gif</path>, который |
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245 и посылается клиенту. |
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246 </listitem> |
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247 |
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248 <listitem> |
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249 Запросу “<literal>/index.php</literal>” также во-первых соответствует префиксный |
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250 location “<literal>/</literal>”, а во-вторых—регулярное выражение |
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251 “<literal>\.(php)$</literal>”. |
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252 Следовательно, он обрабатывается location’ом регулярного выражения |
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253 и запрос передаётся FastCGI-серверу, слушающему на localhost:9000. |
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254 Директива |
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255 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_param"/> |
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256 устанавливает FastCGI-параметр |
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257 <literal>SCRIPT_FILENAME</literal> в “<literal>/data/www/index.php</literal>”, |
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258 и сервер FastCGI выполняет указанный файл. |
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259 Переменная <var>$document_root</var> равна |
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260 значению директивы |
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261 <link doc="ngx_http_core_module.xml" id="root"/>, |
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262 а переменная <var>$fastcgi_script_name</var> равна |
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263 URI запроса, т.е. “<literal>/index.php</literal>”. |
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264 </listitem> |
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265 |
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266 <listitem> |
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267 Запросу “<literal>/about.html</literal>” соответствует только префиксный |
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268 location “<literal>/</literal>”, поэтому запрос обрабатывается в нём. |
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269 Согласно директиве “<literal>root /data/www</literal>” запрос |
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270 отображается в файл <path>/data/www/about.html</path>, который |
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271 и посылается клиенту. |
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272 </listitem> |
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273 |
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274 <listitem> |
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275 Обработка запроса “<literal>/</literal>” более сложная. |
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276 Ему соответствует только префиксный location “<literal>/</literal>”, |
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277 поэтому запрос обрабатывается в нём. |
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278 Затем директива |
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279 <link doc="ngx_http_index_module.xml" id="index"/> |
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280 проверяет существование индексных файлов согласно своих параметров |
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281 и директиве “<literal>root /data/www</literal>”. |
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282 Если файл <path>/data/www/index.html</path> не существует, |
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283 а файл <path>/data/www/index.php</path> существует, то |
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284 директива делает внутреннее перенаправление на “<literal>/index.php</literal>” |
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285 и nginx снова сопоставляет его с location’ами, |
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286 как если бы такой запрос был послан клиентом. |
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287 Как мы видели ранее, перенаправленный запрос будет в конечном итоге |
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288 обработан сервером FastCGI. |
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289 </listitem> |
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290 |
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291 </list> |
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292 |
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293 </para> |
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294 |
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295 </section> |
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296 |
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297 </article> |