Mercurial > hg > nginx-site
annotate xml/ru/docs/njs/examples.xml @ 2537:d6bbfd20c82f
Rephrased a sentence in r.headersOut in njs.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 28 Apr 2020 11:12:01 +0100 |
parents | 87f34fafa4e8 |
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 & 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> |