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annotate xml/ru/docs/http/ngx_http_upstream_hc_module.xml @ 2632:52500ccb82c1

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Updated docs for the upcoming NGINX Plus release.
author Yaroslav Zhuravlev <yar@nginx.com>
date Fri, 04 Dec 2020 13:34:05 +0000
parents d5e576eb7677
children efb3d27dfa23
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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) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_http_upstream_hc_module"
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10 link="/ru/docs/http/ngx_http_upstream_hc_module.html"
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11 lang="ru"
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12 rev="5">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_http_upstream_hc_module</literal>
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18 позволяет активировать периодические проверки работоспособности серверов в
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19 <link doc="ngx_http_upstream_module.xml" id="upstream">группе</link>,
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20 указанной в содержащем location.
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21 Группа должна находиться в
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22 <link doc="ngx_http_upstream_module.xml" id="zone">зоне разделяемой памяти</link>.
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23 </para>
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24
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25 <para>
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26 Если проверка работоспособности была неуспешной,
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27 то сервер признаётся неработоспособным.
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28 Если для группы задано несколько проверок,
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29 то при любой неуспешной проверке соответствующий сервер будет
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30 считаться неработоспособным.
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31 На неработоспособные серверы и серверы в состоянии “checking”
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32 клиентские запросы передаваться не будут.
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33 </para>
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34
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35 <para>
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36 <note>
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37 Обратите внимание, что при использовании проверок
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38 большинство переменных имеют пустые значения.
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39 </note>
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40 </para>
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41
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42 <para>
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43 <note>
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44 Модуль доступен как часть
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45 <commercial_version>коммерческой подписки</commercial_version>.
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46 </note>
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47 </para>
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48
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49 </section>
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50
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51
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52 <section id="example" name="Пример конфигурации">
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53
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54 <para>
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55 <example>
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56 upstream dynamic {
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57 zone upstream_dynamic 64k;
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58
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59 server backend1.example.com weight=5;
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60 server backend2.example.com:8080 fail_timeout=5s slow_start=30s;
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61 server 192.0.2.1 max_fails=3;
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62
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63 server backup1.example.com:8080 backup;
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64 server backup2.example.com:8080 backup;
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65 }
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66
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67 server {
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68 location / {
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69 proxy_pass http://dynamic;
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70 health_check;
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71 }
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72 }
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73 </example>
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74 Каждому серверу группы <literal>backend</literal>
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75 с интервалом в 5 секунд посылаются запросы “<literal>/</literal>”.
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76 Если происходит ошибка или таймаут при работе с сервером, или
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77 код ответа проксируемого сервера не равен
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78 2xx или 3xx, проверка считается неуспешной и сервер
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79 признаётся неработоспособным.
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80 </para>
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81
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82 <para>
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83 Проверки работоспособности могут тестировать код ответа,
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84 наличие или отсутствие определённых полей заголовка и их значений,
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85 а также содержимое тела ответа.
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86 Тесты настраиваются отдельно при помощи директивы <link id="match"/>
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87 и указываются в параметре <literal>match</literal>.
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88 Например:
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89 <example>
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90 http {
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91 server {
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92 ...
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93 location / {
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94 proxy_pass http://backend;
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95 health_check match=welcome;
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96 }
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97 }
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98
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99 match welcome {
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100 status 200;
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101 header Content-Type = text/html;
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102 body ~ "Welcome to nginx!";
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103 }
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104 }
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105 </example>
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106 В такой конфигурации успешный ответ на проверочный запрос
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107 должен иметь код 200, тип содержимого “<literal>text/html</literal>”
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108 и “<literal>Welcome to nginx!</literal>” в теле ответа.
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109 </para>
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110
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111 </section>
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112
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113
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114 <section id="directives" name="Директивы">
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115
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116 <directive name="health_check">
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117 <syntax>[<value>параметры</value>]</syntax>
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118 <default/>
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119 <context>location</context>
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120
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121 <para>
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122 Активирует периодические проверки работоспособности серверов в
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123 <link doc="ngx_http_upstream_module.xml" id="upstream">группе</link>,
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124 указанной в содержащем location.
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125 </para>
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126
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127 <para>
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128 Могут быть заданы следующие необязательные параметры:
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129 <list type="tag">
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130
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131 <tag-name id="health_check_interval">
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132 <literal>interval</literal>=<value>время</value>
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133 </tag-name>
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134 <tag-desc>
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135 задаёт интервал между двумя последовательными проверками,
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136 по умолчанию 5 секунд.
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137 </tag-desc>
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138
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139 <tag-name id="health_check_jitter">
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140 <literal>jitter</literal>=<value>время</value>
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141 </tag-name>
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142 <tag-desc>
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143 задаёт время, в пределах которого
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144 случайным образом задерживается каждая проверка,
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145 по умолчанию задержки нет.
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146 </tag-desc>
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147
1949
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148 <tag-name id="health_check_fails">
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149 <literal>fails</literal>=<value>число</value>
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150 </tag-name>
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151 <tag-desc>
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152 задаёт число последовательных неуспешных проверок для определённого сервера,
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153 после которых сервер будет считаться неработоспособным,
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154 по умолчанию 1.
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155 </tag-desc>
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156
1949
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157 <tag-name id="health_check_passes">
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158 <literal>passes</literal>=<value>число</value>
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159 </tag-name>
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160 <tag-desc>
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161 задаёт число последовательных успешных проверок для определённого сервера,
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162 после которых сервер будет считаться работоспособным,
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163 по умолчанию 1.
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164 </tag-desc>
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165
1949
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166 <tag-name id="health_check_uri">
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167 <literal>uri</literal>=<value>uri</value>
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168 </tag-name>
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169 <tag-desc>
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170 задаёт URI, используемый в запросах, проверяющих работоспособность,
1891
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171 по умолчанию “<literal>/</literal>”.
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172 </tag-desc>
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173
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174 <tag-name id="health_check_mandatory">
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175 <literal>mandatory</literal>
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176 </tag-name>
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177 <tag-desc>
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178 устанавливает исходное состояние “checking” для сервера
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179 до завершения первой проверки работоспособности (1.11.7).
1950
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180 На серверы в состоянии “checking” клиентские запросы передаваться не будут.
1925
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181 Если параметр не указан,
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182 то исходно сервер будет считаться работоспособным.
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183 </tag-desc>
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184
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185 <tag-name id="health_check_match">
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186 <literal>match</literal>=<value>имя</value>
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187 </tag-name>
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188 <tag-desc>
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189 указывает на блок <literal>match</literal> с условиями, которым должен
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190 удовлетворять ответ, чтобы результат проверки считался успешным.
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191 По умолчанию код ответа должен быть 2xx или 3xx.
1636
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192 </tag-desc>
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193
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194 <tag-name id="health_check_port">
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195 <literal>port</literal>=<value>число</value>
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196 </tag-name>
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197 <tag-desc>
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198 задаёт порт, используемый при подключении к серверу
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199 для проверки его работоспособности (1.9.7).
1945
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200 По умолчанию совпадает с портом
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201 <link doc="ngx_http_upstream_module.xml" id="server">сервера</link>.
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202 </tag-desc>
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203
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204 <tag-name id="health_check_grpc">
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205 <literal>type</literal>=<literal>grpc</literal>
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206 [<literal>grpc_service</literal>=<value>имя</value>]
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207 [<literal>grpc_status</literal>=<value>код</value>]
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208 </tag-name>
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209 <tag-desc>
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210 активирует периодические
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211 <link url="https://github.com/grpc/grpc/blob/master/doc/health-checking.md#grpc-health-checking-protocol">проверки
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212 работоспособности</link> gRPC-сервера
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213 или службы gRPC, указанной при помощи необязательного
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214 параметра <literal>grpc_service</literal> (1.19.5).
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215 Если сервер не поддерживает протокол проверки работоспособности gRPC,
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216 то можно использовать необязательный параметр <literal>grpc_status</literal>
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217 для указания
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218 <link url="https://github.com/grpc/grpc/blob/master/doc/statuscodes.md#status-codes-and-their-use-in-grpc">статуса</link>
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219 (например
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220 статус “<literal>12</literal>” / “<literal>UNIMPLEMENTED</literal>”)
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221 при получении которого сервер признаётся работоспособным:
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222 <example>
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223 health_check mandatory type=grpc grpc_status=12;
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224 </example>
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225 Параметр <literal>type</literal>=<literal>grpc</literal>
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226 должен быть указан после остальных параметров директивы,
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227 <literal>grpc_service</literal> и <literal>grpc_status</literal>
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228 должны быть указаны после <literal>type</literal>=<literal>grpc</literal>.
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229 Параметр несовместим с параметрами
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230 <link id="health_check_uri"><literal>uri</literal></link> и
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231 <link id="health_check_match"><literal>match</literal></link>.
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232 </tag-desc>
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233
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234 </list>
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235 </para>
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236
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237 </directive>
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238
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239
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240 <directive name="match">
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241 <syntax block="yes"><value>имя</value></syntax>
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242 <default/>
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243 <context>http</context>
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244
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245 <para>
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246 Задаёт именованный набор тестов для анализа ответов
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247 на запросы проверки работоспособности.
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248 </para>
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249
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250 <para>
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251 В ответе могут быть протестированы следующие объекты:
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252 <list type="tag">
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253
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254 <tag-name><literal>status 200;</literal></tag-name>
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255 <tag-desc>код ответа равен 200</tag-desc>
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256
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257 <tag-name><literal>status ! 500;</literal></tag-name>
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258 <tag-desc>код ответа не равен 500</tag-desc>
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259
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260 <tag-name><literal>status 200 204;</literal></tag-name>
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261 <tag-desc>код ответа равен 200 или 204</tag-desc>
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262
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263 <tag-name><literal>status ! 301 302;</literal></tag-name>
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264 <tag-desc>код ответа не равен ни 301, ни 302</tag-desc>
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265
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266 <tag-name><literal>status 200-399;</literal></tag-name>
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267 <tag-desc>код ответа находится в диапазоне от 200 до 399</tag-desc>
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268
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269 <tag-name><literal>status ! 400-599;</literal></tag-name>
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270 <tag-desc>код ответа находится вне диапазона от 400 до 599</tag-desc>
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271
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272 <tag-name><literal>status 301-303 307;</literal></tag-name>
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273 <tag-desc>код ответа равен 301, 302, 303 или 307</tag-desc>
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274
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275 </list>
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276
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277 <list type="tag">
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278
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279 <tag-name><literal>header Content-Type = text/html;</literal></tag-name>
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280 <tag-desc>
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281 заголовок содержит <header>Content-Type</header>
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282 со значением <literal>text/html</literal>
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283 </tag-desc>
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284
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285 <tag-name><literal>header Content-Type != text/html;</literal></tag-name>
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286 <tag-desc>
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287 заголовок содержит <header>Content-Type</header>
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288 со значением, отличным от <literal>text/html</literal>
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289 </tag-desc>
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290
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291 <tag-name><literal>header Connection ~ close;</literal></tag-name>
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292 <tag-desc>
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293 заголовок содержит <header>Connection</header>
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294 со значением, совпадающим с регулярным выражением <literal>close</literal>
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295 </tag-desc>
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296
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297 <tag-name><literal>header Connection !~ close;</literal></tag-name>
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298 <tag-desc>
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299 заголовок содержит <header>Connection</header>
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300 со значением, не совпадающим с регулярным выражением <literal>close</literal>
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301 </tag-desc>
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302
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303 <tag-name><literal>header Host;</literal></tag-name>
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304 <tag-desc>заголовок содержит <header>Host</header></tag-desc>
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305
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306 <tag-name><literal>header ! X-Accel-Redirect;</literal></tag-name>
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307 <tag-desc>заголовок не содержит <header>X-Accel-Redirect</header></tag-desc>
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308
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309 </list>
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310
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311 <list type="tag">
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312
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313 <tag-name><literal>body ~ "Welcome to nginx!";</literal></tag-name>
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314 <tag-desc>
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315 тело ответа совпадает с регулярным выражением
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316 “<literal>Welcome to nginx!</literal>”
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317 </tag-desc>
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318
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319 <tag-name><literal>body !~ "Welcome to nginx!";</literal></tag-name>
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320 <tag-desc>
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321 тело ответа не совпадает с регулярным выражением
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322 “<literal>Welcome to nginx!</literal>”
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323 </tag-desc>
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324
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325 </list>
2359
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326
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327 <list type="tag">
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328
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329 <tag-name id="match_require"><literal>require</literal>
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330 <value>$переменная</value>
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331 <literal>...;</literal></tag-name>
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332 <tag-desc>
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333 все указанные переменные непустые и не равны “0” (1.15.9).
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334 </tag-desc>
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335
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336 </list>
1242
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337 </para>
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338
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339 <para>
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340 Если задано несколько тестов,
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341 то ответ должен удовлетворять всем тестам.
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342 <note>
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343 Проверяются только первые 256 Кбайт тела ответа.
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344 </note>
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345 </para>
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346
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347 <para>
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348 Примеры:
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349 <example>
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350 # код ответа 200, тип содержимого "text/html"
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351 # и тело ответа содержит "Welcome to nginx!"
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352 match welcome {
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353 status 200;
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354 header Content-Type = text/html;
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355 body ~ "Welcome to nginx!";
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356 }
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357 </example>
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358
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359 <example>
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360 # код ответа не равен 301, 302, 303 и 307 и заголовок не содержит "Refresh:"
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361 match not_redirect {
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362 status ! 301-303 307;
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363 header ! Refresh;
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364 }
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365 </example>
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366
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367 <example>
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368 # код ответа успешный и сервер не в сервисном режиме
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369 match server_ok {
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370 status 200-399;
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371 body !~ "maintenance mode";
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372 }
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373 </example>
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374
2359
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375 <example>
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376 # код ответа равен 200 или 204
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377 map $upstream_status $good_status {
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378 200 1;
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379 204 1;
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380 }
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381
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382 match server_ok {
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383 require $good_status;
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384 }
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385 </example>
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386
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387 </para>
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388
1237
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389 </directive>
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390
76
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391 </section>
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392
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393 </module>