Mercurial > hg > nginx-site
annotate xml/en/docs/njs/examples.xml @ 2531:9c8a89d3876f
Updated njs examples with js_import and corresponding changes.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 22 Apr 2020 22:55:58 +0100 |
parents | 351a669a576d |
children | 87f34fafa4e8 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="Examples" |
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10 link="/en/docs/njs/examples.html" |
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11 lang="en" |
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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 The examples work since |
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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 |
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24 <section id="helloword" name="Hello World"> |
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25 |
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26 <para> |
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27 <path>nginx.conf</path>: |
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28 <example> |
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29 load_module modules/ngx_http_js_module.so; |
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30 |
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31 events {} |
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32 |
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33 http { |
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34 js_import http.js; |
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35 js_content http.hello; |
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36 } |
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37 |
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38 </example> |
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39 </para> |
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40 |
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41 <para> |
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42 <literal>http.js</literal>: |
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43 <example> |
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44 function hello(r) { |
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45 r.return(200, "Hello world!"); |
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46 } |
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47 |
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48 export default {hello}; |
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49 </example> |
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50 </para> |
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51 |
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52 </section> |
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53 |
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54 |
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55 <section id="urldecode" name="URL Decoding"> |
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56 |
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57 <para> |
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58 <path>nginx.conf</path>: |
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59 <example> |
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60 js_import http.js; |
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61 |
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62 js_set $decoded_foo http.decoded_foo; |
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63 </example> |
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64 </para> |
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65 |
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66 <para> |
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67 <path>http.js</path>: |
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68 <example> |
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69 function decoded_foo(r) { |
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70 return decodeURIComponent(r.args.foo); |
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71 } |
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72 |
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73 export default {decoded_foo}; |
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74 </example> |
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75 </para> |
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76 |
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77 </section> |
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78 |
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79 |
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80 <section id="urlencode" name="URL Encoding"> |
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81 |
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82 <para> |
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83 <path>nginx.conf</path>: |
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84 <example> |
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85 js_import http.js; |
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86 |
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87 js_set $encoded_foo http.encoded_foo; |
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88 ... |
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89 |
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90 location / { |
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91 proxy_pass http://example.com?foo=$encoded_foo; |
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92 } |
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93 </example> |
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94 </para> |
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95 |
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96 <para> |
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97 <path>http.js</path>: |
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98 <example> |
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99 function encoded_foo(r) { |
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100 return encodeURIComponent('foo & bar?'); |
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101 } |
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102 |
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103 export default {encoded_foo}; |
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104 </example> |
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105 </para> |
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106 |
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107 </section> |
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108 |
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109 |
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110 <section id="redirect" name="Internal Redirect"> |
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111 |
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112 <para> |
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113 <path>nginx.conf</path>: |
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114 <example> |
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115 js_import http.js; |
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116 |
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117 location /redirect { |
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118 js_content http.redirect; |
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119 } |
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120 |
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121 location @named { |
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122 return 200 named; |
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123 } |
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124 </example> |
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125 </para> |
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126 |
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127 <para> |
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128 <path>http.js</path>: |
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129 <example> |
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130 function redirect(r) { |
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131 r.internalRedirect('@named'); |
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132 } |
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133 |
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134 export default {redirect}; |
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135 </example> |
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136 </para> |
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137 |
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138 </section> |
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139 |
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140 |
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141 <section id="fast_response" name="Returning Fastest Response from Proxy"> |
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142 |
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143 <para> |
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144 <path>nginx.conf</path>: |
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145 <example> |
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146 js_import http.js; |
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147 |
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148 location /start { |
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149 js_content http.content; |
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150 } |
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151 |
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152 location /foo { |
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153 proxy_pass http://backend1; |
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154 } |
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155 |
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156 location /bar { |
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157 proxy_pass http://backend2; |
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158 } |
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159 </example> |
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160 </para> |
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161 |
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162 <para> |
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163 <path>http.js</path>: |
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164 <example> |
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165 function content(r) { |
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166 var n = 0; |
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167 |
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168 function done(res) { |
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169 if (n++ == 0) { |
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170 r.return(res.status, res.responseBody); |
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171 } |
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172 } |
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173 |
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174 r.subrequest('/foo', r.variables.args, done); |
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175 r.subrequest('/bar', r.variables.args, done); |
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176 } |
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177 |
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178 export default {content}; |
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179 </example> |
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180 </para> |
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181 |
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182 </section> |
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183 |
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184 |
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185 <section id="jwt" name="Creating HS JWT"> |
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186 |
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187 <para> |
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188 <path>nginx.conf</path>: |
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189 <example> |
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190 js_import http.js; |
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191 |
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192 js_set $jwt http.jwt; |
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193 </example> |
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194 </para> |
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195 |
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196 <para> |
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197 <path>http.js</path>: |
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198 <example> |
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199 function generate_hs256_jwt(claims, key, valid) { |
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200 var header = { typ: "JWT", alg: "HS256" }; |
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201 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid}); |
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202 |
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203 var s = [header, claims].map(JSON.stringify) |
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204 .map(v=>v.toUTF8()) |
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205 .map(v=>v.toString('base64url')) |
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206 .join('.'); |
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207 |
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208 var h = require('crypto').createHmac('sha256', key); |
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209 |
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210 return s + '.' + h.update(s).digest().toString('base64url'); |
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211 } |
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212 |
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213 function jwt(r) { |
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214 var claims = { |
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215 iss: "nginx", |
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216 sub: "alice", |
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217 foo: 123, |
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218 bar: "qq", |
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219 zyx: false |
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220 }; |
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221 |
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222 return generate_hs256_jwt(claims, 'foo', 600); |
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223 } |
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224 |
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225 export default {jwt}; |
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226 </example> |
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227 </para> |
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228 |
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229 </section> |
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230 |
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231 |
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232 <section id="subrequest" name="Accessing API from a Subrequest"> |
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233 |
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234 <para> |
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235 <path>nginx.conf</path>: |
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236 <example> |
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237 js_import http.js; |
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238 |
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239 keyval_zone zone=foo:10m; |
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240 ... |
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241 |
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242 location /keyval { |
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243 js_content http.set_keyval; |
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244 } |
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245 |
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246 location /version { |
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247 js_content http.version; |
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248 } |
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249 |
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250 location /api { |
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251 api write=on; |
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252 } |
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253 </example> |
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254 </para> |
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255 |
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256 <para> |
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257 <path>http.js</path>: |
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258 <example> |
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259 function set_keyval(r) { |
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260 r.subrequest('/api/5/http/keyvals/foo', |
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261 { method: 'POST', |
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262 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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263 |
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264 function(res) { |
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265 if (res.status >= 300) { |
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266 r.return(res.status, res.responseBody); |
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267 return; |
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268 } |
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269 r.return(500); |
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270 }); |
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271 } |
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272 |
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273 function version(r) { |
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274 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) { |
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275 if (res.status != 200) { |
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276 r.return(res.status); |
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277 return; |
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278 } |
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279 |
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280 var json = JSON.parse(res.responseBody); |
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281 r.return(200, json.version); |
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282 }); |
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283 } |
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284 |
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285 export default {set_keyval, version}; |
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286 </example> |
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287 </para> |
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288 |
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289 </section> |
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290 |
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291 |
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292 <section id="secure_link" name="Creating secure_link Hash"> |
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293 |
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294 <para> |
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295 <path>nginx.conf</path>: |
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296 <example> |
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297 js_import http.js; |
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298 |
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299 js_set $new_foo http.create_secure_link; |
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300 ... |
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301 |
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302 location / { |
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303 secure_link $cookie_foo; |
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304 secure_link_md5 "$uri mykey"; |
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305 ... |
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306 } |
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307 |
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308 location @login { |
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309 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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310 return 302 /; |
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311 } |
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312 </example> |
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313 </para> |
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314 |
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315 <para> |
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316 <path>http.js</path>: |
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317 <example> |
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318 function create_secure_link(r) { |
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319 return require('crypto').createHash('md5') |
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320 .update(r.uri).update(" mykey") |
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321 .digest('base64url'); |
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322 } |
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323 |
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324 export default {create_secure_link}; |
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325 </example> |
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326 </para> |
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327 |
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328 </section> |
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329 |
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330 |
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331 <section id="requests" name="Logging the Number of Requests Per Client"> |
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332 |
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333 <para> |
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334 <path>nginx.conf</path>: |
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335 <example> |
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336 js_import http.js; |
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337 |
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338 js_set $num_requests http.num_requests; |
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339 |
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340 keyval_zone zone=foo:10m; |
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341 |
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342 keyval $remote_addr $foo zone=foo; |
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343 |
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344 log_format bar '$remote_addr [$time_local] $num_requests'; |
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345 access_log logs/access.log bar; |
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346 |
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347 server { |
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348 listen 8000; |
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349 |
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350 location / { |
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351 root html; |
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352 } |
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353 } |
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354 </example> |
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355 </para> |
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356 |
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357 <para> |
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358 <path>http.js</path>: |
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359 <example> |
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360 function num_requests(r) |
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361 { |
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362 var n = r.variables.foo; |
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363 n = n ? Number(n) + 1 : 1; |
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364 r.variables.foo = n; |
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365 return n; |
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366 } |
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367 |
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368 export default {num_requests}; |
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369 </example> |
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370 <note> |
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371 The <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> and |
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372 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> directives |
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373 are available as part of our |
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374 <commercial_version>commercial subscription</commercial_version>. |
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375 </note> |
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376 </para> |
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377 |
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378 </section> |
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379 |
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380 |
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381 <section id="subrequests_chaining" name="Subrequests Chaining"> |
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382 |
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383 <para> |
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384 <path>nginx.conf</path>: |
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385 <example> |
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386 js_import http.js; |
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387 |
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388 location /start { |
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389 js_content http.content; |
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390 } |
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391 |
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392 location /auth { |
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393 proxy_pass http://auth_backend; |
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394 } |
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395 |
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396 location /backend { |
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397 proxy_pass http://backend; |
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398 } |
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399 </example> |
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400 </para> |
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401 |
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402 <para> |
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403 <path>http.js</path>: |
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404 <example> |
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405 function content(r) { |
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406 r.subrequest('/auth') |
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407 .then(reply => JSON.parse(reply.responseBody)) |
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408 .then(response => { |
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409 if (!response['token']) { |
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410 throw new Error("token is not available"); |
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411 } |
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412 return reply['token']; |
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413 }) |
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414 .then(token => { |
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415 r.subrequest('/backend', `token=${token}`) |
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416 .then(reply => r.return(reply.status, reply.responseBody)); |
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417 }) |
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418 .catch(_ => r.return(500)); |
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419 } |
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420 |
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421 export default {content}; |
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422 </example> |
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423 </para> |
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424 |
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425 </section> |
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426 |
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427 </article> |