Mercurial > hg > nginx-site
annotate xml/ru/docs/njs/examples.xml @ 2642:c60bcc0de435
Updated TOC in njs examples.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 20 Jan 2021 09:34:32 +0000 |
parents | 885bcb41fbcf |
children | 4849fa0fd4b4 |
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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 article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="Примеры использования" |
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10 link="/ru/docs/njs/examples.html" |
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11 lang="ru" |
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12 rev="17"> |
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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 Примеры работают начиная с версии |
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18 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>. |
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19 </para> |
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20 |
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21 </section> |
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22 |
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23 <section id="helloword" name="Hello World"> |
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24 |
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25 <para> |
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26 <path>nginx.conf</path>: |
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27 <example> |
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28 events {} |
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29 |
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30 http { |
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31 js_import http.js; |
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32 |
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33 server { |
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34 listen 8000; |
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35 |
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36 location / { |
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37 js_content http.hello; |
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38 } |
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39 } |
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40 } |
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41 </example> |
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42 </para> |
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43 |
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44 <para> |
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45 <literal>http.js</literal>: |
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46 <example> |
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47 function hello(r) { |
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48 r.return(200, "Hello world!"); |
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49 } |
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50 |
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51 export default {hello}; |
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52 </example> |
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53 </para> |
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54 |
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55 </section> |
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56 |
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57 |
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58 <section id="http_auth" name="HTTP-авторизация"> |
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59 |
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60 |
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61 <section id="jwt" name="Создание HS JWT"> |
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62 |
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63 <para> |
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64 <path>nginx.conf</path>: |
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65 <example> |
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66 js_import http.js; |
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67 |
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68 js_set $jwt http.jwt; |
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69 </example> |
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70 </para> |
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71 |
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72 <para> |
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73 <path>http.js</path>: |
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74 <example> |
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75 function generate_hs256_jwt(claims, key, valid) { |
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76 var header = { typ: "JWT", alg: "HS256" }; |
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77 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid}); |
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78 |
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79 var s = [header, claims].map(JSON.stringify) |
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80 .map(v=>v.toString('base64url')) |
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81 .join('.'); |
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82 |
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83 var h = require('crypto').createHmac('sha256', key); |
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84 |
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85 return s + '.' + h.update(s).digest('base64url'); |
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86 } |
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87 |
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88 function jwt(r) { |
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89 var claims = { |
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90 iss: "nginx", |
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91 sub: "alice", |
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92 foo: 123, |
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93 bar: "qq", |
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94 zyx: false |
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95 }; |
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96 |
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97 return generate_hs256_jwt(claims, 'foo', 600); |
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98 } |
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99 |
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100 export default {jwt}; |
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101 </example> |
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102 </para> |
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103 |
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104 </section> |
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105 |
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106 |
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107 <section id="secure_link" name="Создание secure_link хэша"> |
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108 |
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109 <para> |
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110 <path>nginx.conf</path>: |
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111 <example> |
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112 js_import http.js; |
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113 |
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114 js_set $new_foo http.create_secure_link; |
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115 ... |
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116 |
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117 location / { |
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118 secure_link $cookie_foo; |
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119 secure_link_md5 "$uri mykey"; |
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120 ... |
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121 } |
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122 |
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123 location @login { |
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124 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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125 return 302 /; |
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126 } |
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127 </example> |
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128 </para> |
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129 |
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130 <para> |
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131 <path>http.js</path>: |
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132 <example> |
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133 function create_secure_link(r) { |
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134 return require('crypto').createHash('md5') |
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135 .update(r.uri).update(" mykey") |
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136 .digest('base64url'); |
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137 } |
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138 |
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139 export default {create_secure_link}; |
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140 </example> |
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141 </para> |
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142 |
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143 </section> |
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144 |
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145 |
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146 <section id="jwt_field" name="Получение произвольного поля JWT |
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147 как значение переменной nginx"> |
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148 |
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149 <para> |
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150 <path>nginx.conf</path>: |
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151 <example> |
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152 js_import http.js; |
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153 |
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154 js_set $jwt_payload_sub main.jwt_payload_sub; |
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155 |
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156 server { |
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157 ... |
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158 |
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159 location /jwt { |
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160 return 200 $jwt_payload_sub; |
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161 } |
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162 } |
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163 </example> |
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164 </para> |
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165 |
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166 <para> |
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167 <path>http.js</path>: |
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168 <example> |
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169 function jwt(data) { |
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170 var parts = data.split('.').slice(0,2) |
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171 .map(v=>Buffer.from(v, 'base64url').toString()) |
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172 .map(JSON.parse); |
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173 return { headers:parts[0], payload: parts[1] }; |
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174 } |
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175 |
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176 function jwt_payload_sub(r) { |
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177 return jwt(r.headersIn.Authorization.slice(7)).payload.sub; |
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178 } |
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179 |
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180 export default {jwt_payload_sub} |
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181 </example> |
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182 </para> |
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183 |
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184 </section> |
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185 |
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186 </section> |
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187 |
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188 |
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189 <section id="http_proxying" name="HTTP-проксирование"> |
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190 |
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191 |
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192 <section id="subrequest" name="Доступ к API из подзапроса"> |
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193 |
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194 <para> |
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195 <path>nginx.conf</path>: |
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196 <example> |
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197 js_import http.js; |
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198 |
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199 keyval_zone zone=foo:10m; |
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200 ... |
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201 |
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202 location /keyval { |
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203 js_content http.set_keyval; |
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204 } |
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205 |
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206 location /version { |
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207 js_content http.version; |
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208 } |
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209 |
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210 location /api { |
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211 api write=on; |
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212 } |
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213 </example> |
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214 </para> |
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215 |
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216 <para> |
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217 <path>http.js</path>: |
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218 <example> |
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219 function set_keyval(r) { |
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220 r.subrequest('/api/5/http/keyvals/foo', |
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221 { method: 'POST', |
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222 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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223 |
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224 function(res) { |
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225 if (res.status >= 300) { |
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226 r.return(res.status, res.responseBody); |
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227 return; |
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228 } |
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229 r.return(500); |
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230 }); |
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231 } |
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232 |
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233 function version(r) { |
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234 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) { |
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235 if (res.status != 200) { |
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236 r.return(res.status); |
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237 return; |
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238 } |
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239 |
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240 var json = JSON.parse(res.responseBody); |
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241 r.return(200, json.version); |
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242 }); |
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243 } |
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244 |
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245 export default {set_keyval, version}; |
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246 </example> |
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247 </para> |
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248 |
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249 </section> |
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250 |
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251 |
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252 <section id="fast_response" name="Возвращение самого быстрого ответа от прокси"> |
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253 |
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254 <para> |
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255 <path>nginx.conf</path>: |
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256 <example> |
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257 js_import http.js; |
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258 |
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259 location /start { |
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260 js_content http.content; |
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261 } |
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262 |
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263 location /foo { |
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264 proxy_pass http://backend1; |
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265 } |
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266 |
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267 location /bar { |
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268 proxy_pass http://backend2; |
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269 } |
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270 </example> |
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271 </para> |
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272 |
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273 <para> |
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274 <path>http.js</path>: |
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275 <example> |
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276 function content(r) { |
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277 var n = 0; |
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278 |
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279 function done(res) { |
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280 if (n++ == 0) { |
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281 r.return(res.status, res.responseBody); |
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282 } |
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283 } |
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284 |
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285 r.subrequest('/foo', r.variables.args, done); |
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286 r.subrequest('/bar', r.variables.args, done); |
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287 } |
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288 |
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289 export default {content}; |
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290 </example> |
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291 </para> |
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292 |
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293 </section> |
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294 |
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295 |
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296 <section id="subrequests_chaining" name="Построение цепочки подзапросов"> |
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297 |
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298 <para> |
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299 <path>nginx.conf</path>: |
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300 <example> |
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301 js_import http.js; |
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302 |
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303 location /start { |
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304 js_content http.content; |
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305 } |
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306 |
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307 location /auth { |
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308 proxy_pass http://auth_backend; |
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309 } |
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310 |
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311 location /backend { |
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312 proxy_pass http://backend; |
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313 } |
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314 </example> |
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315 </para> |
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316 |
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317 <para> |
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318 <path>http.js</path>: |
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319 <example> |
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320 function content(r) { |
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321 r.subrequest('/auth') |
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322 .then(reply => JSON.parse(reply.responseBody)) |
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323 .then(response => { |
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324 if (!response['token']) { |
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325 throw new Error("token is not available"); |
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326 } |
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327 return reply['token']; |
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328 }) |
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329 .then(token => { |
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330 r.subrequest('/backend', `token=${token}`) |
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331 .then(reply => r.return(reply.status, reply.responseBody)); |
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332 }) |
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333 .catch(_ => r.return(500)); |
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334 } |
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335 |
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336 export default {content}; |
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337 </example> |
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338 </para> |
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339 |
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340 </section> |
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341 |
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342 </section> |
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343 |
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344 |
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345 <section id="misc" name="Разное"> |
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346 |
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347 |
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348 <section id="redirect" name="Внутренняя переадресация"> |
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349 |
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350 <para> |
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351 <path>nginx.conf</path>: |
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352 <example> |
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353 js_import http.js; |
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354 |
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355 location /redirect { |
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356 js_content http.redirect; |
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357 } |
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358 |
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359 location @named { |
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360 return 200 named; |
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361 } |
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362 </example> |
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363 </para> |
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364 |
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365 <para> |
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366 <path>http.js</path>: |
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367 <example> |
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368 function redirect(r) { |
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369 r.internalRedirect('@named'); |
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370 } |
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371 |
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372 export default {redirect}; |
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373 </example> |
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374 </para> |
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375 |
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376 </section> |
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377 |
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378 <section id="requests" name="Запись в лог количества запросов от клиента"> |
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379 |
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380 <para> |
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381 <path>nginx.conf</path>: |
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382 <example> |
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383 js_import http.js; |
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384 |
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385 js_set $num_requests http.num_requests; |
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386 |
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387 keyval_zone zone=foo:10m; |
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388 |
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389 keyval $remote_addr $foo zone=foo; |
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390 |
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391 log_format bar '$remote_addr [$time_local] $num_requests'; |
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392 access_log logs/access.log bar; |
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393 |
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394 server { |
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395 listen 8000; |
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396 |
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397 location / { |
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398 root html; |
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399 } |
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400 } |
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401 </example> |
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402 </para> |
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403 |
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404 <para> |
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405 <path>http.js</path>: |
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406 <example> |
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407 function num_requests(r) |
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408 { |
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409 var n = r.variables.foo; |
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410 n = n ? Number(n) + 1 : 1; |
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411 r.variables.foo = n; |
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412 return n; |
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413 } |
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414 |
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415 export default {num_requests}; |
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416 </example> |
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417 <note> |
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418 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и |
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419 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> |
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420 доступны как часть |
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421 <commercial_version>коммерческой подписки</commercial_version>. |
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422 </note> |
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423 </para> |
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424 |
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425 </section> |
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426 |
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427 |
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428 <section id="urldecode" name="Декодирование URL"> |
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429 |
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430 <para> |
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431 <path>nginx.conf</path>: |
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432 <example> |
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433 js_import http.js; |
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434 |
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435 js_set $decoded_foo http.decoded_foo; |
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436 </example> |
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437 </para> |
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438 |
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439 <para> |
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440 <path>http.js</path>: |
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441 <example> |
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442 function decoded_foo(r) { |
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443 return decodeURIComponent(r.args.foo); |
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444 } |
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445 |
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446 export default {decoded_foo}; |
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447 </example> |
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448 </para> |
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449 |
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450 </section> |
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451 |
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452 |
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453 <section id="urlencode" name="Кодирование URL"> |
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454 |
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455 <para> |
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456 <path>nginx.conf</path>: |
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457 <example> |
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458 js_import http.js; |
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459 |
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460 js_set $encoded_foo http.encoded_foo; |
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461 ... |
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462 |
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463 location / { |
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464 proxy_pass http://example.com?foo=$encoded_foo; |
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465 } |
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466 </example> |
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467 </para> |
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468 |
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469 <para> |
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470 <path>http.js</path>: |
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471 <example> |
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472 function encoded_foo(r) { |
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473 return encodeURIComponent('foo & bar?'); |
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474 } |
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475 |
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476 export default {encoded_foo}; |
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477 </example> |
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478 </para> |
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479 |
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480 </section> |
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481 |
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482 </section> |
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483 |
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484 </article> |