Mercurial > hg > nginx-site
annotate xml/ru/docs/njs/examples.xml @ 2532:423d813dc8bb
Documented support for multi-value headers in r.headersOut.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 23 Apr 2020 12:57:43 +0100 |
parents | 9c8a89d3876f |
children | 87f34fafa4e8 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="Примеры использования" |
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10 link="/ru/docs/njs/examples.html" |
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11 lang="ru" |
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12 rev="13"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 Примеры работают начиная с версии |
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18 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>. |
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19 </para> |
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20 |
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21 </section> |
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22 |
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23 <section id="helloword" name="Hello World"> |
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24 |
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25 <para> |
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26 <path>nginx.conf</path>: |
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27 <example> |
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28 load_module modules/ngx_http_js_module.so; |
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29 |
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30 events {} |
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31 |
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32 http { |
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33 js_import http.js; |
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34 js_content http.hello; |
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35 } |
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36 |
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37 </example> |
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38 </para> |
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39 |
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40 <para> |
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41 <literal>http.js</literal>: |
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42 <example> |
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43 function hello(r) { |
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44 r.return(200, "Hello world!"); |
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45 } |
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46 |
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47 export default {hello}; |
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48 </example> |
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49 </para> |
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50 |
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51 </section> |
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52 |
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53 |
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54 <section id="urldecode" name="Декодирование URL"> |
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55 |
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56 <para> |
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57 <path>nginx.conf</path>: |
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58 <example> |
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59 js_import http.js; |
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60 |
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61 js_set $decoded_foo http.decoded_foo; |
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62 </example> |
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63 </para> |
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64 |
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65 <para> |
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66 <path>http.js</path>: |
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67 <example> |
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68 function decoded_foo(r) { |
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69 return decodeURIComponent(r.args.foo); |
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70 } |
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71 |
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72 export default {decoded_foo}; |
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73 </example> |
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74 </para> |
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75 |
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76 </section> |
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77 |
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78 |
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79 <section id="urlencode" name="Кодирование URL"> |
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80 |
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81 <para> |
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82 <path>nginx.conf</path>: |
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83 <example> |
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84 js_import http.js; |
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85 |
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86 js_set $encoded_foo http.encoded_foo; |
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87 ... |
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88 |
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89 location / { |
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90 proxy_pass http://example.com?foo=$encoded_foo; |
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91 } |
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92 </example> |
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93 </para> |
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94 |
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95 <para> |
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96 <path>http.js</path>: |
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97 <example> |
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98 function encoded_foo(r) { |
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99 return encodeURIComponent('foo & bar?'); |
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100 } |
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101 |
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102 export default {encoded_foo}; |
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103 </example> |
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104 </para> |
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105 |
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106 </section> |
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107 |
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108 |
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109 <section id="redirect" name="Внутренняя переадресация"> |
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110 |
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111 <para> |
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112 <path>nginx.conf</path>: |
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113 <example> |
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114 js_import http.js; |
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115 |
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116 location /redirect { |
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117 js_content http.redirect; |
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118 } |
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119 |
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120 location @named { |
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121 return 200 named; |
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122 } |
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123 </example> |
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124 </para> |
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125 |
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126 <para> |
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127 <path>http.js</path>: |
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128 <example> |
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129 function redirect(r) { |
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130 r.internalRedirect('@named'); |
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131 } |
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132 |
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133 export default {redirect}; |
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134 </example> |
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135 </para> |
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136 |
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137 </section> |
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138 |
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139 |
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140 <section id="fast_response" name="Возвращение самого быстрого ответа от прокси"> |
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141 |
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142 <para> |
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143 <path>nginx.conf</path>: |
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144 <example> |
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145 js_import http.js; |
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146 |
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147 location /start { |
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148 js_content http.content; |
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149 } |
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150 |
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151 location /foo { |
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152 proxy_pass http://backend1; |
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153 } |
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154 |
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155 location /bar { |
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156 proxy_pass http://backend2; |
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157 } |
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158 </example> |
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159 </para> |
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160 |
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161 <para> |
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162 <path>http.js</path>: |
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163 <example> |
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164 function content(r) { |
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165 var n = 0; |
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166 |
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167 function done(res) { |
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168 if (n++ == 0) { |
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169 r.return(res.status, res.responseBody); |
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170 } |
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171 } |
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172 |
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173 r.subrequest('/foo', r.variables.args, done); |
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174 r.subrequest('/bar', r.variables.args, done); |
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175 } |
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176 |
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177 export default {content}; |
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178 </example> |
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179 </para> |
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180 |
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181 </section> |
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182 |
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183 |
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184 <section id="jwt" name="Создание HS JWT"> |
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185 |
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186 <para> |
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187 <path>nginx.conf</path>: |
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188 <example> |
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189 js_import http.js; |
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190 |
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191 js_set $jwt http.jwt; |
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192 </example> |
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193 </para> |
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194 |
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195 <para> |
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196 <path>http.js</path>: |
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197 <example> |
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198 function generate_hs256_jwt(claims, key, valid) { |
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199 var header = { typ: "JWT", alg: "HS256" }; |
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200 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid}); |
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201 |
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202 var s = [header, claims].map(JSON.stringify) |
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203 .map(v=>v.toUTF8()) |
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204 .map(v=>v.toString('base64url')) |
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205 .join('.'); |
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206 |
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207 var h = require('crypto').createHmac('sha256', key); |
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208 |
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209 return s + '.' + h.update(s).digest().toString('base64url'); |
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210 } |
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211 |
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212 function jwt(r) { |
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213 var claims = { |
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214 iss: "nginx", |
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215 sub: "alice", |
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216 foo: 123, |
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217 bar: "qq", |
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218 zyx: false |
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219 }; |
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220 |
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221 return generate_hs256_jwt(claims, 'foo', 600); |
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222 } |
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223 |
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224 export default {jwt}; |
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225 </example> |
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226 </para> |
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227 |
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228 </section> |
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229 |
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230 |
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231 <section id="subrequest" name="Доступ к API из подзапроса"> |
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232 |
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233 <para> |
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234 <path>nginx.conf</path>: |
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235 <example> |
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236 js_import http.js; |
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237 |
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238 keyval_zone zone=foo:10m; |
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239 ... |
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240 |
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241 location /keyval { |
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242 js_content http.set_keyval; |
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243 } |
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244 |
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245 location /version { |
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246 js_content http.version; |
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247 } |
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248 |
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249 location /api { |
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250 api write=on; |
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251 } |
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252 </example> |
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253 </para> |
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254 |
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255 <para> |
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256 <path>http.js</path>: |
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257 <example> |
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258 function set_keyval(r) { |
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259 r.subrequest('/api/5/http/keyvals/foo', |
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260 { method: 'POST', |
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261 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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262 |
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263 function(res) { |
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264 if (res.status >= 300) { |
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265 r.return(res.status, res.responseBody); |
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266 return; |
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267 } |
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268 r.return(500); |
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269 }); |
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270 } |
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271 |
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272 function version(r) { |
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273 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) { |
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274 if (res.status != 200) { |
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275 r.return(res.status); |
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276 return; |
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277 } |
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278 |
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279 var json = JSON.parse(res.responseBody); |
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280 r.return(200, json.version); |
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281 }); |
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282 } |
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283 |
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284 export default {set_keyval, version}; |
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285 </example> |
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286 </para> |
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287 |
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288 </section> |
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289 |
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290 |
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291 <section id="secure_link" name="Создание secure_link хэша"> |
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292 |
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293 <para> |
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294 <path>nginx.conf</path>: |
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295 <example> |
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296 js_import http.js; |
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297 |
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298 js_set $new_foo http.create_secure_link; |
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299 ... |
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300 |
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301 location / { |
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302 secure_link $cookie_foo; |
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303 secure_link_md5 "$uri mykey"; |
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304 ... |
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305 } |
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306 |
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307 location @login { |
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308 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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309 return 302 /; |
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310 } |
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311 </example> |
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312 </para> |
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313 |
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314 <para> |
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315 <path>http.js</path>: |
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316 <example> |
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317 function create_secure_link(r) { |
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318 return require('crypto').createHash('md5') |
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319 .update(r.uri).update(" mykey") |
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320 .digest('base64url'); |
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321 } |
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322 |
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323 export default {create_secure_link}; |
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324 </example> |
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325 </para> |
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326 |
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327 </section> |
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328 |
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329 |
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330 <section id="requests" name="Запись в лог количества запросов от клиента"> |
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331 |
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332 <para> |
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333 <path>nginx.conf</path>: |
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334 <example> |
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335 js_import http.js; |
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336 |
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337 js_set $num_requests http.num_requests; |
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338 |
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339 keyval_zone zone=foo:10m; |
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340 |
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341 keyval $remote_addr $foo zone=foo; |
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342 |
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343 log_format bar '$remote_addr [$time_local] $num_requests'; |
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344 access_log logs/access.log bar; |
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345 |
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346 server { |
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347 listen 8000; |
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348 |
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349 location / { |
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350 root html; |
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351 } |
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352 } |
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353 </example> |
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354 </para> |
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355 |
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356 <para> |
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357 <path>http.js</path>: |
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358 <example> |
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359 function num_requests(r) |
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360 { |
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361 var n = r.variables.foo; |
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362 n = n ? Number(n) + 1 : 1; |
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363 r.variables.foo = n; |
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364 return n; |
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365 } |
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366 |
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367 export default {num_requests}; |
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368 </example> |
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369 <note> |
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370 Директивы <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> и |
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371 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> |
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372 доступны как часть |
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373 <commercial_version>коммерческой подписки</commercial_version>. |
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374 </note> |
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375 </para> |
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376 |
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377 </section> |
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378 |
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379 |
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380 <section id="subrequests_chaining" name="Построение цепочки подзапросов"> |
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381 |
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382 <para> |
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383 <path>nginx.conf</path>: |
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384 <example> |
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385 js_import http.js; |
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386 |
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387 location /start { |
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388 js_content http.content; |
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389 } |
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390 |
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391 location /auth { |
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392 proxy_pass http://auth_backend; |
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393 } |
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394 |
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395 location /backend { |
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396 proxy_pass http://backend; |
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397 } |
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398 </example> |
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399 </para> |
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400 |
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401 <para> |
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402 <path>http.js</path>: |
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403 <example> |
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404 function content(r) { |
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405 r.subrequest('/auth') |
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406 .then(reply => JSON.parse(reply.responseBody)) |
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407 .then(response => { |
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408 if (!response['token']) { |
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409 throw new Error("token is not available"); |
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410 } |
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411 return reply['token']; |
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412 }) |
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413 .then(token => { |
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414 r.subrequest('/backend', `token=${token}`) |
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415 .then(reply => r.return(reply.status, reply.responseBody)); |
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416 }) |
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417 .catch(_ => r.return(500)); |
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418 } |
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419 |
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420 export default {content}; |
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421 </example> |
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422 </para> |
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423 |
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424 </section> |
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425 |
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426 </article> |