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annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 1622:c4c1dddfedac

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Unified *_pass address descriptions.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 10 Dec 2015 17:42:48 +0300
parents 91a064bdb4f9
children 9c98c4498f08
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_memcached_module"
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11 link="/en/docs/http/ngx_http_memcached_module.html"
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12 lang="en"
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13 rev="11">
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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_memcached_module</literal> module is used to obtain
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19 responses from a memcached server.
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20 The key is set in the <var>$memcached_key</var> variable.
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21 A response should be put in memcached in advance by means
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22 external to nginx.
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23 </para>
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24
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25 </section>
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26
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27
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28 <section id="example" name="Example Configuration">
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29
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30 <para>
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31 <example>
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32 server {
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33 location / {
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34 set $memcached_key "$uri?$args";
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35 memcached_pass host:11211;
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36 error_page 404 502 504 = @fallback;
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37 }
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38
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39 location @fallback {
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40 proxy_pass http://backend;
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41 }
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section id="directives" name="Directives">
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50
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51 <directive name="memcached_bind">
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52 <syntax><value>address</value> | <literal>off</literal></syntax>
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53 <default/>
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54 <context>http</context>
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55 <context>server</context>
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56 <context>location</context>
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57 <appeared-in>0.8.22</appeared-in>
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58
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59 <para>
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60 Makes outgoing connections to a memcached server originate
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61 from the specified local IP <value>address</value>.
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62 Parameter value can contain variables (1.3.12).
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63 The special value <literal>off</literal> (1.3.12) cancels the effect
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64 of the <literal>memcached_bind</literal> directive
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65 inherited from the previous configuration level, which allows the
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66 system to auto-assign the local IP address.
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67 </para>
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68
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69 </directive>
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71
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72 <directive name="memcached_buffer_size">
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73 <syntax><value>size</value></syntax>
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74 <default>4k|8k</default>
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75 <context>http</context>
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76 <context>server</context>
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77 <context>location</context>
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78
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79 <para>
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80 Sets the <value>size</value> of the buffer used for reading the response
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81 received from the memcached server.
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82 The response is passed to the client synchronously, as soon as it is received.
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83 </para>
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84
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85 </directive>
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86
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87
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88 <directive name="memcached_connect_timeout">
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89 <syntax><value>time</value></syntax>
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90 <default>60s</default>
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91 <context>http</context>
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92 <context>server</context>
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93 <context>location</context>
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94
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95 <para>
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96 Defines a timeout for establishing a connection with a memcached server.
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97 It should be noted that this timeout cannot usually exceed 75 seconds.
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98 </para>
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99
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100 </directive>
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101
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102
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103 <directive name="memcached_force_ranges">
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104 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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105 <default>off</default>
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106 <context>http</context>
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107 <context>server</context>
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108 <context>location</context>
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109 <appeared-in>1.7.7</appeared-in>
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110
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111 <para>
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112 Enables byte-range support
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113 for both cached and uncached responses from the memcached server
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114 regardless of the <header>Accept-Ranges</header> field in these responses.
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115 </para>
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116
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117 </directive>
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118
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119
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120 <directive name="memcached_gzip_flag">
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121 <syntax><value>flag</value></syntax>
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122 <default></default>
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123 <context>http</context>
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124 <context>server</context>
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125 <context>location</context>
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126 <appeared-in>1.3.6</appeared-in>
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127
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128 <para>
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129 Enables the test for the <value>flag</value> presence in the memcached
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130 server response and sets the “<literal>Content-Encoding</literal>”
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131 response header field to “<literal>gzip</literal>”
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132 if the flag is set.
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133 </para>
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134
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135 </directive>
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136
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137
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138 <directive name="memcached_next_upstream">
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139 <syntax>
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140 <literal>error</literal> |
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141 <literal>timeout</literal> |
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142 <literal>invalid_response</literal> |
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143 <literal>not_found</literal> |
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144 <literal>off</literal>
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145 ...</syntax>
363
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146 <default>error timeout</default>
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147 <context>http</context>
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148 <context>server</context>
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149 <context>location</context>
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150
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151 <para>
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152 Specifies in which cases a request should be passed to the next server:
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153 <list type="tag">
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154
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155 <tag-name><literal>error</literal></tag-name>
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156 <tag-desc>an error occurred while establishing a connection with the
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157 server, passing a request to it, or reading the response header;</tag-desc>
363
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158
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159 <tag-name><literal>timeout</literal></tag-name>
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160 <tag-desc>a timeout has occurred while establishing a connection with the
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161 server, passing a request to it, or reading the response header;</tag-desc>
363
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162
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163 <tag-name><literal>invalid_response</literal></tag-name>
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164 <tag-desc>a server returned an empty or invalid response;</tag-desc>
363
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165
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166 <tag-name><literal>not_found</literal></tag-name>
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167 <tag-desc>a response was not found on the server;</tag-desc>
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168
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169 <tag-name><literal>off</literal></tag-name>
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170 <tag-desc>disables passing a request to the next server.</tag-desc>
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171
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172 </list>
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173 </para>
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174
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175 <para>
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176 One should bear in mind that passing a request to the next server is
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177 only possible if nothing has been sent to a client yet.
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178 That is, if an error or timeout occurs in the middle of the
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179 transferring of a response, fixing this is impossible.
363
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180 </para>
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181
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182 <para>
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183 The directive also defines what is considered an
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184 <link doc="ngx_http_upstream_module.xml" id="max_fails">unsuccessful
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185 attempt</link> of communication with a server.
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186 The cases of <literal>error</literal>, <literal>timeout</literal> and
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187 <literal>invalid_header</literal> are always considered unsuccessful attempts,
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188 even if they are not specified in the directive.
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189 The case of <literal>not_found</literal>
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190 is never considered an unsuccessful attempt.
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191 </para>
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192
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193 <para>
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194 Passing a request to the next server can be limited by
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195 <link id="memcached_next_upstream_tries">the number of tries</link>
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196 and by <link id="memcached_next_upstream_timeout">time</link>.
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197 </para>
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198
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199 </directive>
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200
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201
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202 <directive name="memcached_next_upstream_timeout">
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203 <syntax><value>time</value></syntax>
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204 <default>0</default>
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205 <context>http</context>
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206 <context>server</context>
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207 <context>location</context>
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208 <appeared-in>1.7.5</appeared-in>
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209
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210 <para>
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211 Limits the time allowed to pass a request to the
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212 <link id="memcached_next_upstream">next server</link>.
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213 The <literal>0</literal> value turns off this limitation.
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214 </para>
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215
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216 </directive>
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217
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218
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219 <directive name="memcached_next_upstream_tries">
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220 <syntax><value>number</value></syntax>
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221 <default>0</default>
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222 <context>http</context>
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223 <context>server</context>
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224 <context>location</context>
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225 <appeared-in>1.7.5</appeared-in>
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226
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227 <para>
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228 Limits the number of possible tries for passing a request to the
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229 <link id="memcached_next_upstream">next server</link>.
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230 The <literal>0</literal> value turns off this limitation.
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231 </para>
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232
363
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233 </directive>
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234
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235
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236 <directive name="memcached_pass">
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237 <syntax><value>address</value></syntax>
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238 <default/>
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239 <context>location</context>
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240 <context>if in location</context>
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241
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242 <para>
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243 Sets the memcached server address.
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244 The address can be specified as a domain name or IP address,
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245 and a port:
363
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246 <example>
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247 memcached_pass localhost:11211;
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248 </example>
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249 or as a UNIX-domain socket path:
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250 <example>
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251 memcached_pass unix:/tmp/memcached.socket;
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252 </example>
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253 </para>
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254
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255 <para>
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256 If a domain name resolves to several addresses, all of them will be
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257 used in a round-robin fashion.
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258 In addition, an address can be specified as a
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259 <link doc="ngx_http_upstream_module.xml">server group</link>.
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260 </para>
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261
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262 </directive>
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263
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264
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265 <directive name="memcached_read_timeout">
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266 <syntax><value>time</value></syntax>
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267 <default>60s</default>
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268 <context>http</context>
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269 <context>server</context>
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270 <context>location</context>
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271
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272 <para>
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273 Defines a timeout for reading a response from the memcached server.
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274 The timeout is set only between two successive read operations,
363
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275 not for the transmission of the whole response.
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276 If the memcached server does not transmit anything within this time,
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277 the connection is closed.
363
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278 </para>
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279
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280 </directive>
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281
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282
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283 <directive name="memcached_send_timeout">
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284 <syntax><value>time</value></syntax>
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285 <default>60s</default>
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286 <context>http</context>
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287 <context>server</context>
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288 <context>location</context>
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289
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290 <para>
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291 Sets a timeout for transmitting a request to the memcached server.
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292 The timeout is set only between two successive write operations,
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293 not for the transmission of the whole request.
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294 If the memcached server does not receive anything within this time,
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295 the connection is closed.
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296 </para>
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297
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298 </directive>
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299
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300 </section>
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301
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302
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303 <section id="variables" name="Embedded Variables">
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304
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305 <para>
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306 <list type="tag">
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307
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308 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name>
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309 <tag-desc>
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310 Defines a key for obtaining response from a memcached server.
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311 </tag-desc>
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312
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313 </list>
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314 </para>
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315
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316 </section>
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317
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318 </module>