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annotate xml/ru/docs/njs/examples.xml @ 2640:885bcb41fbcf

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Added an example to njs examples.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 19 Jan 2021 12:40:34 +0000
parents 7ad967af16b8
children c60bcc0de435
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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="urldecode" name="Декодирование URL">
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59
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60 <para>
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61 <path>nginx.conf</path>:
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62 <example>
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63 js_import http.js;
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64
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65 js_set $decoded_foo http.decoded_foo;
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66 </example>
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67 </para>
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68
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69 <para>
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70 <path>http.js</path>:
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71 <example>
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72 function decoded_foo(r) {
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73 return decodeURIComponent(r.args.foo);
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74 }
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75
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76 export default {decoded_foo};
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77 </example>
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78 </para>
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79
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80 </section>
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81
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82
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83 <section id="urlencode" name="Кодирование URL">
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84
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85 <para>
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86 <path>nginx.conf</path>:
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87 <example>
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88 js_import http.js;
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89
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90 js_set $encoded_foo http.encoded_foo;
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91 ...
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92
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93 location / {
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94 proxy_pass http://example.com?foo=$encoded_foo;
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95 }
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96 </example>
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97 </para>
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98
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99 <para>
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100 <path>http.js</path>:
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101 <example>
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102 function encoded_foo(r) {
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103 return encodeURIComponent('foo &amp; bar?');
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104 }
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105
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106 export default {encoded_foo};
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107 </example>
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108 </para>
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109
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110 </section>
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111
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112
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113 <section id="redirect" name="Внутренняя переадресация">
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114
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115 <para>
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116 <path>nginx.conf</path>:
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117 <example>
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118 js_import http.js;
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119
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120 location /redirect {
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121 js_content http.redirect;
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122 }
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123
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124 location @named {
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125 return 200 named;
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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 redirect(r) {
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134 r.internalRedirect('@named');
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135 }
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136
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137 export default {redirect};
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138 </example>
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139 </para>
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140
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141 </section>
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142
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143
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144 <section id="fast_response" name="Возвращение самого быстрого ответа от прокси">
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145
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146 <para>
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147 <path>nginx.conf</path>:
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148 <example>
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149 js_import http.js;
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150
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151 location /start {
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152 js_content http.content;
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153 }
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154
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155 location /foo {
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156 proxy_pass http://backend1;
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157 }
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158
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159 location /bar {
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160 proxy_pass http://backend2;
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161 }
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162 </example>
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163 </para>
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164
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165 <para>
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166 <path>http.js</path>:
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167 <example>
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168 function content(r) {
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169 var n = 0;
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170
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171 function done(res) {
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172 if (n++ == 0) {
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173 r.return(res.status, res.responseBody);
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174 }
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175 }
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176
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177 r.subrequest('/foo', r.variables.args, done);
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178 r.subrequest('/bar', r.variables.args, done);
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179 }
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180
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181 export default {content};
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182 </example>
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183 </para>
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184
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185 </section>
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186
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187
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188 <section id="jwt" name="Создание HS JWT">
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189
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190 <para>
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191 <path>nginx.conf</path>:
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192 <example>
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193 js_import http.js;
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194
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195 js_set $jwt http.jwt;
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196 </example>
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197 </para>
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198
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199 <para>
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200 <path>http.js</path>:
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201 <example>
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202 function generate_hs256_jwt(claims, key, valid) {
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203 var header = { typ: "JWT", alg: "HS256" };
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204 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid});
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205
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206 var s = [header, claims].map(JSON.stringify)
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207 .map(v=>v.toString('base64url'))
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208 .join('.');
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209
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210 var h = require('crypto').createHmac('sha256', key);
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211
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212 return s + '.' + h.update(s).digest('base64url');
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213 }
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214
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215 function jwt(r) {
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216 var claims = {
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217 iss: "nginx",
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218 sub: "alice",
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219 foo: 123,
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220 bar: "qq",
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221 zyx: false
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222 };
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223
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224 return generate_hs256_jwt(claims, 'foo', 600);
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225 }
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226
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227 export default {jwt};
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228 </example>
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229 </para>
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230
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231 </section>
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232
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233
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234 <section id="jwt_field" name="Получение произвольного поля JWT
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235 как значение переменной nginx">
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236
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237 <para>
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238 <path>nginx.conf</path>:
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239 <example>
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240 js_import http.js;
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241
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242 js_set $jwt_payload_sub main.jwt_payload_sub;
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243
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244 server {
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245 ...
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246
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247 location /jwt {
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248 return 200 $jwt_payload_sub;
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249 }
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250 }
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251 </example>
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252 </para>
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253
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254 <para>
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255 <path>http.js</path>:
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256 <example>
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257 function jwt(data) {
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258 var parts = data.split('.').slice(0,2)
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259 .map(v=>Buffer.from(v, 'base64url').toString())
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260 .map(JSON.parse);
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261 return { headers:parts[0], payload: parts[1] };
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262 }
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263
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264 function jwt_payload_sub(r) {
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265 return jwt(r.headersIn.Authorization.slice(7)).payload.sub;
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266 }
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267
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268 export default {jwt_payload_sub}
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269 </example>
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270 </para>
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271
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272 </section>
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273
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274
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275 <section id="subrequest" name="Доступ к API из подзапроса">
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276
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277 <para>
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278 <path>nginx.conf</path>:
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279 <example>
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280 js_import http.js;
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281
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282 keyval_zone zone=foo:10m;
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283 ...
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284
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285 location /keyval {
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286 js_content http.set_keyval;
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287 }
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288
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289 location /version {
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290 js_content http.version;
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291 }
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292
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293 location /api {
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294 api write=on;
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295 }
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296 </example>
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297 </para>
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298
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299 <para>
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300 <path>http.js</path>:
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301 <example>
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302 function set_keyval(r) {
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303 r.subrequest('/api/5/http/keyvals/foo',
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304 { method: 'POST',
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305 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })},
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306
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307 function(res) {
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308 if (res.status >= 300) {
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309 r.return(res.status, res.responseBody);
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310 return;
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311 }
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312 r.return(500);
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313 });
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314 }
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315
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316 function version(r) {
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317 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) {
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318 if (res.status != 200) {
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319 r.return(res.status);
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320 return;
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321 }
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322
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323 var json = JSON.parse(res.responseBody);
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324 r.return(200, json.version);
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325 });
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326 }
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327
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328 export default {set_keyval, version};
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329 </example>
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330 </para>
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331
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332 </section>
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333
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334
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335 <section id="secure_link" name="Создание secure_link хэша">
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336
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337 <para>
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338 <path>nginx.conf</path>:
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339 <example>
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340 js_import http.js;
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341
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342 js_set $new_foo http.create_secure_link;
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343 ...
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344
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345 location / {
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346 secure_link $cookie_foo;
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347 secure_link_md5 "$uri mykey";
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348 ...
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349 }
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350
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351 location @login {
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352 add_header Set-Cookie "foo=$new_foo; Max-Age=60";
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353 return 302 /;
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354 }
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355 </example>
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356 </para>
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357
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358 <para>
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359 <path>http.js</path>:
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360 <example>
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361 function create_secure_link(r) {
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362 return require('crypto').createHash('md5')
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363 .update(r.uri).update(" mykey")
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364 .digest('base64url');
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365 }
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366
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367 export default {create_secure_link};
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368 </example>
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369 </para>
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370
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371 </section>
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372
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373
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374 <section id="requests" name="Запись в лог количества запросов от клиента">
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375
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376 <para>
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377 <path>nginx.conf</path>:
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378 <example>
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379 js_import http.js;
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380
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381 js_set $num_requests http.num_requests;
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382
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383 keyval_zone zone=foo:10m;
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384
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385 keyval $remote_addr $foo zone=foo;
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386
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387 log_format bar '$remote_addr [$time_local] $num_requests';
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388 access_log logs/access.log bar;
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389
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390 server {
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391 listen 8000;
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392
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393 location / {
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394 root html;
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395 }
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396 }
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397 </example>
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398 </para>
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399
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400 <para>
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401 <path>http.js</path>:
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402 <example>
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403 function num_requests(r)
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404 {
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405 var n = r.variables.foo;
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406 n = n ? Number(n) + 1 : 1;
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407 r.variables.foo = n;
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408 return n;
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409 }
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410
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411 export default {num_requests};
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412 </example>
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413 <note>
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414 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и
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415 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/>
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416 доступны как часть
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417 <commercial_version>коммерческой подписки</commercial_version>.
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418 </note>
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419 </para>
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420
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421 </section>
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422
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423
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424 <section id="subrequests_chaining" name="Построение цепочки подзапросов">
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425
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426 <para>
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427 <path>nginx.conf</path>:
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428 <example>
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429 js_import http.js;
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430
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431 location /start {
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432 js_content http.content;
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433 }
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434
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435 location /auth {
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436 proxy_pass http://auth_backend;
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437 }
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438
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439 location /backend {
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440 proxy_pass http://backend;
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441 }
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442 </example>
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443 </para>
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444
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445 <para>
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446 <path>http.js</path>:
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447 <example>
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448 function content(r) {
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449 r.subrequest('/auth')
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450 .then(reply => JSON.parse(reply.responseBody))
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451 .then(response => {
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452 if (!response['token']) {
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453 throw new Error("token is not available");
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454 }
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455 return reply['token'];
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456 })
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457 .then(token => {
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458 r.subrequest('/backend', `token=${token}`)
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459 .then(reply => r.return(reply.status, reply.responseBody));
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460 })
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461 .catch(_ => r.return(500));
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462 }
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463
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464 export default {content};
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465 </example>
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466 </para>
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467
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468 </section>
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469
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470 </article>