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annotate xml/ru/docs/njs/examples.xml @ 2536:87f34fafa4e8

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Removed load_module from "Hello World" example in njs.
author Yaroslav Zhuravlev <yar@nginx.com>
date Fri, 24 Apr 2020 21:32:52 +0100
parents 9c8a89d3876f
children c81b1fadbcf3
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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="14">
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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 js_content http.hello;
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33 }
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34
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35 </example>
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36 </para>
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37
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38 <para>
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39 <literal>http.js</literal>:
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40 <example>
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41 function hello(r) {
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42 r.return(200, "Hello world!");
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43 }
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44
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45 export default {hello};
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46 </example>
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47 </para>
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48
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49 </section>
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50
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51
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52 <section id="urldecode" name="Декодирование URL">
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53
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54 <para>
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55 <path>nginx.conf</path>:
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56 <example>
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57 js_import http.js;
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58
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59 js_set $decoded_foo http.decoded_foo;
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60 </example>
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61 </para>
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62
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63 <para>
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64 <path>http.js</path>:
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65 <example>
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66 function decoded_foo(r) {
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67 return decodeURIComponent(r.args.foo);
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68 }
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69
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70 export default {decoded_foo};
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71 </example>
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72 </para>
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73
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74 </section>
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75
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76
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77 <section id="urlencode" name="Кодирование URL">
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78
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79 <para>
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80 <path>nginx.conf</path>:
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81 <example>
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82 js_import http.js;
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83
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84 js_set $encoded_foo http.encoded_foo;
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85 ...
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86
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87 location / {
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88 proxy_pass http://example.com?foo=$encoded_foo;
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89 }
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90 </example>
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91 </para>
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92
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93 <para>
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94 <path>http.js</path>:
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95 <example>
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96 function encoded_foo(r) {
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97 return encodeURIComponent('foo &amp; bar?');
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98 }
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99
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100 export default {encoded_foo};
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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="redirect" name="Внутренняя переадресация">
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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 location /redirect {
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115 js_content http.redirect;
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116 }
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117
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118 location @named {
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119 return 200 named;
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120 }
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121 </example>
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122 </para>
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123
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124 <para>
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125 <path>http.js</path>:
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126 <example>
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127 function redirect(r) {
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128 r.internalRedirect('@named');
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129 }
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130
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131 export default {redirect};
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132 </example>
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133 </para>
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134
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135 </section>
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136
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137
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138 <section id="fast_response" name="Возвращение самого быстрого ответа от прокси">
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139
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140 <para>
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141 <path>nginx.conf</path>:
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142 <example>
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143 js_import http.js;
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144
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145 location /start {
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146 js_content http.content;
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147 }
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148
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149 location /foo {
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150 proxy_pass http://backend1;
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151 }
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152
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153 location /bar {
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154 proxy_pass http://backend2;
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155 }
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156 </example>
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157 </para>
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158
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159 <para>
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160 <path>http.js</path>:
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161 <example>
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162 function content(r) {
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163 var n = 0;
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164
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165 function done(res) {
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166 if (n++ == 0) {
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167 r.return(res.status, res.responseBody);
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168 }
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169 }
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170
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171 r.subrequest('/foo', r.variables.args, done);
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172 r.subrequest('/bar', r.variables.args, done);
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173 }
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174
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175 export default {content};
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176 </example>
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177 </para>
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178
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179 </section>
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180
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181
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182 <section id="jwt" name="Создание HS JWT">
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183
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184 <para>
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185 <path>nginx.conf</path>:
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186 <example>
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187 js_import http.js;
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188
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189 js_set $jwt http.jwt;
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190 </example>
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191 </para>
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192
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193 <para>
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194 <path>http.js</path>:
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195 <example>
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196 function generate_hs256_jwt(claims, key, valid) {
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197 var header = { typ: "JWT", alg: "HS256" };
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198 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid});
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199
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200 var s = [header, claims].map(JSON.stringify)
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201 .map(v=>v.toUTF8())
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202 .map(v=>v.toString('base64url'))
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203 .join('.');
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204
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205 var h = require('crypto').createHmac('sha256', key);
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206
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207 return s + '.' + h.update(s).digest().toString('base64url');
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208 }
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209
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210 function jwt(r) {
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211 var claims = {
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212 iss: "nginx",
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213 sub: "alice",
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214 foo: 123,
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215 bar: "qq",
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216 zyx: false
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217 };
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218
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219 return generate_hs256_jwt(claims, 'foo', 600);
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220 }
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221
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222 export default {jwt};
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223 </example>
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224 </para>
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225
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226 </section>
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227
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228
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229 <section id="subrequest" name="Доступ к API из подзапроса">
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230
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231 <para>
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232 <path>nginx.conf</path>:
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233 <example>
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234 js_import http.js;
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235
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236 keyval_zone zone=foo:10m;
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237 ...
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238
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239 location /keyval {
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240 js_content http.set_keyval;
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241 }
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242
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243 location /version {
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244 js_content http.version;
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245 }
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246
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247 location /api {
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248 api write=on;
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249 }
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250 </example>
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251 </para>
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252
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253 <para>
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254 <path>http.js</path>:
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255 <example>
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256 function set_keyval(r) {
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257 r.subrequest('/api/5/http/keyvals/foo',
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258 { method: 'POST',
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259 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })},
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260
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261 function(res) {
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262 if (res.status >= 300) {
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263 r.return(res.status, res.responseBody);
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264 return;
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265 }
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266 r.return(500);
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267 });
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268 }
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269
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270 function version(r) {
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271 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) {
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272 if (res.status != 200) {
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273 r.return(res.status);
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274 return;
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275 }
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276
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277 var json = JSON.parse(res.responseBody);
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278 r.return(200, json.version);
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279 });
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280 }
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281
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282 export default {set_keyval, version};
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283 </example>
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284 </para>
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285
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286 </section>
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287
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288
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289 <section id="secure_link" name="Создание secure_link хэша">
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290
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291 <para>
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292 <path>nginx.conf</path>:
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293 <example>
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294 js_import http.js;
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295
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296 js_set $new_foo http.create_secure_link;
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297 ...
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298
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299 location / {
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300 secure_link $cookie_foo;
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301 secure_link_md5 "$uri mykey";
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302 ...
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303 }
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304
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305 location @login {
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306 add_header Set-Cookie "foo=$new_foo; Max-Age=60";
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307 return 302 /;
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308 }
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309 </example>
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310 </para>
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311
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312 <para>
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313 <path>http.js</path>:
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314 <example>
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315 function create_secure_link(r) {
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316 return require('crypto').createHash('md5')
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317 .update(r.uri).update(" mykey")
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318 .digest('base64url');
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319 }
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320
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321 export default {create_secure_link};
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322 </example>
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323 </para>
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324
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325 </section>
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326
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327
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328 <section id="requests" name="Запись в лог количества запросов от клиента">
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329
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330 <para>
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331 <path>nginx.conf</path>:
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332 <example>
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333 js_import http.js;
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334
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335 js_set $num_requests http.num_requests;
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336
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337 keyval_zone zone=foo:10m;
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338
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339 keyval $remote_addr $foo zone=foo;
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340
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341 log_format bar '$remote_addr [$time_local] $num_requests';
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342 access_log logs/access.log bar;
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343
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344 server {
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345 listen 8000;
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346
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347 location / {
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348 root html;
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349 }
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350 }
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351 </example>
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352 </para>
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353
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354 <para>
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355 <path>http.js</path>:
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356 <example>
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357 function num_requests(r)
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358 {
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359 var n = r.variables.foo;
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360 n = n ? Number(n) + 1 : 1;
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361 r.variables.foo = n;
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362 return n;
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363 }
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364
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365 export default {num_requests};
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366 </example>
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367 <note>
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368 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и
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369 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/>
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370 доступны как часть
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371 <commercial_version>коммерческой подписки</commercial_version>.
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372 </note>
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373 </para>
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374
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375 </section>
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376
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377
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378 <section id="subrequests_chaining" name="Построение цепочки подзапросов">
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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 location /start {
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386 js_content http.content;
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387 }
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388
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389 location /auth {
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390 proxy_pass http://auth_backend;
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391 }
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392
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393 location /backend {
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394 proxy_pass http://backend;
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395 }
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396 </example>
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397 </para>
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398
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399 <para>
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400 <path>http.js</path>:
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401 <example>
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402 function content(r) {
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403 r.subrequest('/auth')
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404 .then(reply => JSON.parse(reply.responseBody))
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405 .then(response => {
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406 if (!response['token']) {
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407 throw new Error("token is not available");
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408 }
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409 return reply['token'];
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410 })
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411 .then(token => {
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412 r.subrequest('/backend', `token=${token}`)
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413 .then(reply => r.return(reply.status, reply.responseBody));
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414 })
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415 .catch(_ => r.return(500));
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416 }
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417
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418 export default {content};
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419 </example>
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420 </para>
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421
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422 </section>
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423
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424 </article>