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Updated njs examples with js_import and corresponding changes.
author Yaroslav Zhuravlev <yar@nginx.com>
date Wed, 22 Apr 2020 22:55:58 +0100
parents 351a669a576d
children 87f34fafa4e8
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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="13">
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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 load_module modules/ngx_http_js_module.so;
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29
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30 events {}
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31
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32 http {
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33 js_import http.js;
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34 js_content http.hello;
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35 }
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36
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37 </example>
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38 </para>
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39
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40 <para>
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41 <literal>http.js</literal>:
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42 <example>
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43 function hello(r) {
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44 r.return(200, "Hello world!");
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45 }
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46
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47 export default {hello};
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48 </example>
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49 </para>
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50
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51 </section>
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52
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53
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54 <section id="urldecode" name="Декодирование URL">
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55
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56 <para>
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57 <path>nginx.conf</path>:
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58 <example>
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59 js_import http.js;
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60
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61 js_set $decoded_foo http.decoded_foo;
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62 </example>
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63 </para>
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64
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65 <para>
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66 <path>http.js</path>:
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67 <example>
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68 function decoded_foo(r) {
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69 return decodeURIComponent(r.args.foo);
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70 }
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71
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72 export default {decoded_foo};
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73 </example>
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74 </para>
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75
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76 </section>
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77
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78
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79 <section id="urlencode" name="Кодирование URL">
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80
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81 <para>
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82 <path>nginx.conf</path>:
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83 <example>
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84 js_import http.js;
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85
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86 js_set $encoded_foo http.encoded_foo;
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87 ...
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88
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89 location / {
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90 proxy_pass http://example.com?foo=$encoded_foo;
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91 }
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92 </example>
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93 </para>
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94
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95 <para>
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96 <path>http.js</path>:
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97 <example>
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98 function encoded_foo(r) {
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99 return encodeURIComponent('foo &amp; bar?');
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100 }
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101
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102 export default {encoded_foo};
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103 </example>
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104 </para>
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105
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106 </section>
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107
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108
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109 <section id="redirect" name="Внутренняя переадресация">
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110
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111 <para>
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112 <path>nginx.conf</path>:
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113 <example>
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114 js_import http.js;
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115
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116 location /redirect {
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117 js_content http.redirect;
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118 }
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119
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120 location @named {
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121 return 200 named;
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122 }
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123 </example>
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124 </para>
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125
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126 <para>
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127 <path>http.js</path>:
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128 <example>
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129 function redirect(r) {
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130 r.internalRedirect('@named');
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131 }
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132
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133 export default {redirect};
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134 </example>
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135 </para>
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136
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137 </section>
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138
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139
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140 <section id="fast_response" name="Возвращение самого быстрого ответа от прокси">
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141
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142 <para>
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143 <path>nginx.conf</path>:
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144 <example>
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145 js_import http.js;
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146
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147 location /start {
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148 js_content http.content;
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149 }
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150
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151 location /foo {
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152 proxy_pass http://backend1;
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153 }
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154
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155 location /bar {
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156 proxy_pass http://backend2;
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157 }
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158 </example>
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159 </para>
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160
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161 <para>
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162 <path>http.js</path>:
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163 <example>
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164 function content(r) {
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165 var n = 0;
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166
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167 function done(res) {
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168 if (n++ == 0) {
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169 r.return(res.status, res.responseBody);
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170 }
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171 }
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172
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173 r.subrequest('/foo', r.variables.args, done);
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174 r.subrequest('/bar', r.variables.args, done);
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175 }
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176
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177 export default {content};
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178 </example>
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179 </para>
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180
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181 </section>
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182
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183
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184 <section id="jwt" name="Создание HS JWT">
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185
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186 <para>
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187 <path>nginx.conf</path>:
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188 <example>
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189 js_import http.js;
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190
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191 js_set $jwt http.jwt;
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192 </example>
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193 </para>
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194
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195 <para>
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196 <path>http.js</path>:
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197 <example>
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198 function generate_hs256_jwt(claims, key, valid) {
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199 var header = { typ: "JWT", alg: "HS256" };
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200 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid});
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201
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202 var s = [header, claims].map(JSON.stringify)
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203 .map(v=>v.toUTF8())
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204 .map(v=>v.toString('base64url'))
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205 .join('.');
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206
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207 var h = require('crypto').createHmac('sha256', key);
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208
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209 return s + '.' + h.update(s).digest().toString('base64url');
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210 }
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211
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212 function jwt(r) {
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213 var claims = {
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214 iss: "nginx",
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215 sub: "alice",
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216 foo: 123,
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217 bar: "qq",
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218 zyx: false
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219 };
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220
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221 return generate_hs256_jwt(claims, 'foo', 600);
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222 }
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223
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224 export default {jwt};
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225 </example>
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226 </para>
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227
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228 </section>
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229
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230
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231 <section id="subrequest" name="Доступ к API из подзапроса">
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232
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233 <para>
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234 <path>nginx.conf</path>:
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235 <example>
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236 js_import http.js;
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237
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238 keyval_zone zone=foo:10m;
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239 ...
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240
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241 location /keyval {
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242 js_content http.set_keyval;
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243 }
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244
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245 location /version {
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246 js_content http.version;
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247 }
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248
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249 location /api {
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250 api write=on;
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251 }
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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 <path>http.js</path>:
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257 <example>
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258 function set_keyval(r) {
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259 r.subrequest('/api/5/http/keyvals/foo',
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260 { method: 'POST',
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261 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })},
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262
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263 function(res) {
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264 if (res.status >= 300) {
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265 r.return(res.status, res.responseBody);
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266 return;
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267 }
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268 r.return(500);
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269 });
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270 }
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271
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272 function version(r) {
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273 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) {
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274 if (res.status != 200) {
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275 r.return(res.status);
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276 return;
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277 }
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278
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279 var json = JSON.parse(res.responseBody);
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280 r.return(200, json.version);
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281 });
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282 }
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283
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284 export default {set_keyval, version};
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285 </example>
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286 </para>
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287
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288 </section>
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289
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290
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291 <section id="secure_link" name="Создание secure_link хэша">
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292
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293 <para>
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294 <path>nginx.conf</path>:
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295 <example>
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296 js_import http.js;
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297
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298 js_set $new_foo http.create_secure_link;
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299 ...
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300
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301 location / {
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302 secure_link $cookie_foo;
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303 secure_link_md5 "$uri mykey";
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304 ...
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305 }
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306
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307 location @login {
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308 add_header Set-Cookie "foo=$new_foo; Max-Age=60";
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309 return 302 /;
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310 }
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311 </example>
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312 </para>
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313
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314 <para>
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315 <path>http.js</path>:
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316 <example>
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317 function create_secure_link(r) {
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318 return require('crypto').createHash('md5')
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319 .update(r.uri).update(" mykey")
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320 .digest('base64url');
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321 }
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322
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323 export default {create_secure_link};
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324 </example>
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325 </para>
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326
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327 </section>
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328
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329
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330 <section id="requests" name="Запись в лог количества запросов от клиента">
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331
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332 <para>
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333 <path>nginx.conf</path>:
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334 <example>
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335 js_import http.js;
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336
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337 js_set $num_requests http.num_requests;
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338
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339 keyval_zone zone=foo:10m;
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340
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341 keyval $remote_addr $foo zone=foo;
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342
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343 log_format bar '$remote_addr [$time_local] $num_requests';
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344 access_log logs/access.log bar;
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345
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346 server {
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347 listen 8000;
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348
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349 location / {
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350 root html;
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351 }
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352 }
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353 </example>
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354 </para>
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355
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356 <para>
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357 <path>http.js</path>:
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358 <example>
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359 function num_requests(r)
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360 {
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361 var n = r.variables.foo;
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362 n = n ? Number(n) + 1 : 1;
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363 r.variables.foo = n;
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364 return n;
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365 }
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366
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367 export default {num_requests};
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368 </example>
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369 <note>
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370 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и
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371 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/>
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372 доступны как часть
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373 <commercial_version>коммерческой подписки</commercial_version>.
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374 </note>
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375 </para>
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376
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377 </section>
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378
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379
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380 <section id="subrequests_chaining" name="Построение цепочки подзапросов">
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381
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382 <para>
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383 <path>nginx.conf</path>:
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384 <example>
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385 js_import http.js;
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386
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387 location /start {
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388 js_content http.content;
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389 }
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390
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391 location /auth {
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392 proxy_pass http://auth_backend;
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393 }
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394
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395 location /backend {
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396 proxy_pass http://backend;
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397 }
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398 </example>
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399 </para>
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400
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401 <para>
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402 <path>http.js</path>:
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403 <example>
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404 function content(r) {
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405 r.subrequest('/auth')
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406 .then(reply => JSON.parse(reply.responseBody))
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407 .then(response => {
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408 if (!response['token']) {
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409 throw new Error("token is not available");
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410 }
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411 return reply['token'];
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412 })
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413 .then(token => {
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414 r.subrequest('/backend', `token=${token}`)
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415 .then(reply => r.return(reply.status, reply.responseBody));
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416 })
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417 .catch(_ => r.return(500));
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418 }
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419
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420 export default {content};
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421 </example>
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422 </para>
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423
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424 </section>
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425
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426 </article>