Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 1248:6d51bb4f19f7
Gzip: fixed minor flaws in the "gzip_proxied" directive.
author | Gunnlaugur Thor Briem <gunnlaugur@gmail.com> |
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date | Sat, 12 Jul 2014 19:44:01 +0000 |
parents | a8a643647c76 |
children | 57fc39924d42 |
rev | line source |
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English translation of ngx_http_memcached_module.
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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" |
589 | 12 lang="en" |
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13 rev="7"> |
363
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
966 | 18 The <literal>ngx_http_memcached_module</literal> module is used to obtain |
363
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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. |
966 | 21 A response should be put in memcached in advance by means |
363
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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> |
966 | 60 Makes outgoing connections to a memcached server originate |
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61 from the specified local IP <value>address</value>. |
966 | 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 |
966 | 65 inherited from the previous configuration level, which allows the |
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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70 |
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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 |
363
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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> |
966 | 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_gzip_flag"> |
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104 <syntax><value>flag</value></syntax> |
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105 <default></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>1.3.6</appeared-in> |
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110 |
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111 <para> |
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112 Enables the test for the <value>flag</value> presence in the memcached |
966 | 113 server response and sets the “<literal>Content-Encoding</literal>” |
114 response header field to “<literal>gzip</literal>” | |
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115 if the flag is set. |
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116 </para> |
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117 |
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118 </directive> |
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119 |
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120 |
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121 <directive name="memcached_next_upstream"> |
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122 <syntax> |
364 | 123 <literal>error</literal> | |
124 <literal>timeout</literal> | | |
125 <literal>invalid_response</literal> | | |
126 <literal>not_found</literal> | | |
127 <literal>off</literal> | |
128 ...</syntax> | |
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129 <default>error timeout</default> |
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130 <context>http</context> |
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131 <context>server</context> |
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132 <context>location</context> |
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133 |
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134 <para> |
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135 Specifies in which cases a request should be passed to the next server: |
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136 <list type="tag"> |
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137 |
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138 <tag-name><literal>error</literal></tag-name> |
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139 <tag-desc>an error occurred while establishing a connection with the |
966 | 140 server, passing a request to it, or reading the response header;</tag-desc> |
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141 |
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142 <tag-name><literal>timeout</literal></tag-name> |
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143 <tag-desc>a timeout has occurred while establishing a connection with the |
966 | 144 server, passing a request to it, or reading the response header;</tag-desc> |
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145 |
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146 <tag-name><literal>invalid_response</literal></tag-name> |
966 | 147 <tag-desc>a server returned an empty or invalid response;</tag-desc> |
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148 |
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149 <tag-name><literal>not_found</literal></tag-name> |
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150 <tag-desc>a response was not found on the server;</tag-desc> |
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151 |
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152 <tag-name><literal>off</literal></tag-name> |
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153 <tag-desc>disables passing a request to the next server.</tag-desc> |
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154 |
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155 </list> |
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156 </para> |
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157 |
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158 <para> |
966 | 159 One should bear in mind that passing a request to the next server is |
160 only possible if nothing has been sent to a client yet. | |
161 That is, if an error or timeout occurs in the middle of the | |
162 transferring of a response, fixing this is impossible. | |
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163 </para> |
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164 |
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165 <para> |
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166 The directive also defines what is considered an unsuccessful attempt |
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167 of communication with a |
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168 <link doc="ngx_http_upstream_module.xml" id="server"/>. |
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169 The cases of <literal>error</literal>, <literal>timeout</literal> and |
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170 <literal>invalid_header</literal> are always considered unsuccessful attempts, |
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171 even if they are not specified in the directive. |
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172 The case of <literal>not_found</literal> |
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173 is never considered an unsuccessful attempt. |
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174 </para> |
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175 |
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176 </directive> |
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177 |
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178 |
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179 <directive name="memcached_pass"> |
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180 <syntax><value>address</value></syntax> |
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181 <default/> |
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182 <context>location</context> |
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183 <context>if in location</context> |
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184 |
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185 <para> |
966 | 186 Sets the memcached server address. |
187 The address can be specified as a domain name or an address, and a port: | |
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188 <example> |
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189 memcached_pass localhost:11211; |
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190 </example> |
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191 or as a UNIX-domain socket path: |
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192 <example> |
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193 memcached_pass unix:/tmp/memcached.socket; |
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194 </example> |
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195 </para> |
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196 |
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197 <para> |
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198 If a domain name resolves to several addresses, all of them will be |
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199 used in a round-robin fashion. |
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200 In addition, an address can be specified as a |
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201 <link doc="ngx_http_upstream_module.xml">server group</link>. |
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202 </para> |
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203 |
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204 </directive> |
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205 |
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206 |
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207 <directive name="memcached_read_timeout"> |
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208 <syntax><value>time</value></syntax> |
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209 <default>60s</default> |
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210 <context>http</context> |
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211 <context>server</context> |
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212 <context>location</context> |
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213 |
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214 <para> |
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215 Defines a timeout for reading a response from the memcached server. |
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216 The timeout is set only between two successive read operations, |
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217 not for the transmission of the whole response. |
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218 If the memcached server does not transmit anything within this time, |
966 | 219 the connection is closed. |
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220 </para> |
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221 |
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222 </directive> |
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223 |
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224 |
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225 <directive name="memcached_send_timeout"> |
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226 <syntax><value>time</value></syntax> |
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227 <default>60s</default> |
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228 <context>http</context> |
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229 <context>server</context> |
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230 <context>location</context> |
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231 |
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232 <para> |
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233 Sets a timeout for transmitting a request to the memcached server. |
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234 The timeout is set only between two successive write operations, |
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235 not for the transmission of the whole request. |
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236 If the memcached server does not receive anything within this time, |
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237 the connection is closed. |
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238 </para> |
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239 |
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240 </directive> |
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241 |
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242 </section> |
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243 |
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244 |
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245 <section id="variables" name="Embedded Variables"> |
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246 |
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247 <para> |
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248 <list type="tag"> |
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249 |
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250 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name> |
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251 <tag-desc> |
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252 Defines a key for obtaining response from a memcached server. |
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253 </tag-desc> |
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254 |
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255 </list> |
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256 </para> |
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257 |
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258 </section> |
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259 |
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260 </module> |