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Updated hello_world example in njs.
author Yaroslav Zhuravlev <yar@nginx.com>
date Fri, 19 Jun 2020 12:48:01 +0100
parents 87f34fafa4e8
children 7ad967af16b8
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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="15">
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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.toUTF8())
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208 .map(v=>v.toString('base64url'))
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209 .join('.');
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210
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211 var h = require('crypto').createHmac('sha256', key);
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212
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213 return s + '.' + h.update(s).digest().toString('base64url');
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214 }
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215
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216 function jwt(r) {
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217 var claims = {
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218 iss: "nginx",
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219 sub: "alice",
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220 foo: 123,
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221 bar: "qq",
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222 zyx: false
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223 };
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224
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225 return generate_hs256_jwt(claims, 'foo', 600);
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226 }
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227
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228 export default {jwt};
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229 </example>
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230 </para>
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231
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232 </section>
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233
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234
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235 <section id="subrequest" name="Доступ к API из подзапроса">
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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 keyval_zone zone=foo:10m;
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243 ...
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244
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245 location /keyval {
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246 js_content http.set_keyval;
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247 }
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248
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249 location /version {
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250 js_content http.version;
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251 }
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252
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253 location /api {
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254 api write=on;
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255 }
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256 </example>
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257 </para>
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258
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259 <para>
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260 <path>http.js</path>:
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261 <example>
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262 function set_keyval(r) {
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263 r.subrequest('/api/5/http/keyvals/foo',
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264 { method: 'POST',
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265 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })},
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266
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267 function(res) {
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268 if (res.status >= 300) {
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269 r.return(res.status, res.responseBody);
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270 return;
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271 }
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272 r.return(500);
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273 });
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274 }
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275
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276 function version(r) {
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277 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) {
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278 if (res.status != 200) {
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279 r.return(res.status);
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280 return;
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281 }
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282
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283 var json = JSON.parse(res.responseBody);
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284 r.return(200, json.version);
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285 });
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286 }
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287
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288 export default {set_keyval, version};
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289 </example>
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290 </para>
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291
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292 </section>
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293
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294
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295 <section id="secure_link" name="Создание secure_link хэша">
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296
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297 <para>
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298 <path>nginx.conf</path>:
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299 <example>
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300 js_import http.js;
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301
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302 js_set $new_foo http.create_secure_link;
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303 ...
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304
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305 location / {
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306 secure_link $cookie_foo;
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307 secure_link_md5 "$uri mykey";
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308 ...
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309 }
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310
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311 location @login {
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312 add_header Set-Cookie "foo=$new_foo; Max-Age=60";
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313 return 302 /;
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314 }
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315 </example>
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316 </para>
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317
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318 <para>
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319 <path>http.js</path>:
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320 <example>
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321 function create_secure_link(r) {
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322 return require('crypto').createHash('md5')
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323 .update(r.uri).update(" mykey")
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324 .digest('base64url');
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325 }
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326
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327 export default {create_secure_link};
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328 </example>
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329 </para>
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330
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331 </section>
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332
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333
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334 <section id="requests" name="Запись в лог количества запросов от клиента">
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335
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336 <para>
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337 <path>nginx.conf</path>:
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338 <example>
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339 js_import http.js;
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340
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341 js_set $num_requests http.num_requests;
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342
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343 keyval_zone zone=foo:10m;
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344
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345 keyval $remote_addr $foo zone=foo;
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346
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347 log_format bar '$remote_addr [$time_local] $num_requests';
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348 access_log logs/access.log bar;
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349
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350 server {
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351 listen 8000;
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352
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353 location / {
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354 root html;
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355 }
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356 }
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357 </example>
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358 </para>
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359
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360 <para>
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361 <path>http.js</path>:
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362 <example>
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363 function num_requests(r)
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364 {
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365 var n = r.variables.foo;
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366 n = n ? Number(n) + 1 : 1;
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367 r.variables.foo = n;
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368 return n;
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369 }
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370
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371 export default {num_requests};
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372 </example>
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373 <note>
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374 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и
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375 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/>
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376 доступны как часть
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377 <commercial_version>коммерческой подписки</commercial_version>.
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378 </note>
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379 </para>
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380
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381 </section>
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382
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383
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384 <section id="subrequests_chaining" name="Построение цепочки подзапросов">
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385
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386 <para>
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387 <path>nginx.conf</path>:
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388 <example>
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389 js_import http.js;
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390
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391 location /start {
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392 js_content http.content;
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393 }
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394
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395 location /auth {
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396 proxy_pass http://auth_backend;
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397 }
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398
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399 location /backend {
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400 proxy_pass http://backend;
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401 }
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402 </example>
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403 </para>
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404
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405 <para>
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406 <path>http.js</path>:
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407 <example>
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408 function content(r) {
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409 r.subrequest('/auth')
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410 .then(reply => JSON.parse(reply.responseBody))
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411 .then(response => {
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412 if (!response['token']) {
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413 throw new Error("token is not available");
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414 }
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415 return reply['token'];
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416 })
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417 .then(token => {
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418 r.subrequest('/backend', `token=${token}`)
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419 .then(reply => r.return(reply.status, reply.responseBody));
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420 })
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421 .catch(_ => r.return(500));
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422 }
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423
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424 export default {content};
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425 </example>
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426 </para>
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427
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428 </section>
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429
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430 </article>