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annotate xml/en/docs/njs/examples.xml @ 2640:885bcb41fbcf

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Added an example to njs examples.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 19 Jan 2021 12:40:34 +0000
parents 7ad967af16b8
children c60bcc0de435
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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="17">
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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 events {}
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30
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31 http {
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32 js_import http.js;
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33
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34 server {
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35 listen 8000;
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36
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37 location / {
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38 js_content http.hello;
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39 }
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40 }
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41 }
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42 </example>
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43 </para>
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44
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45 <para>
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46 <literal>http.js</literal>:
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47 <example>
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48 function hello(r) {
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49 r.return(200, "Hello world!");
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50 }
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51
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52 export default {hello};
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53 </example>
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54 </para>
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55
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56 </section>
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57
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58
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59 <section id="urldecode" name="URL Decoding">
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60
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61 <para>
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62 <path>nginx.conf</path>:
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63 <example>
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64 js_import http.js;
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65
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66 js_set $decoded_foo http.decoded_foo;
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67 </example>
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68 </para>
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69
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70 <para>
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71 <path>http.js</path>:
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72 <example>
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73 function decoded_foo(r) {
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74 return decodeURIComponent(r.args.foo);
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75 }
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76
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77 export default {decoded_foo};
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78 </example>
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79 </para>
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80
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81 </section>
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82
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83
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84 <section id="urlencode" name="URL Encoding">
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85
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86 <para>
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87 <path>nginx.conf</path>:
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88 <example>
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89 js_import http.js;
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90
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91 js_set $encoded_foo http.encoded_foo;
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92 ...
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93
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94 location / {
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95 proxy_pass http://example.com?foo=$encoded_foo;
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96 }
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97 </example>
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98 </para>
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99
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100 <para>
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101 <path>http.js</path>:
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102 <example>
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103 function encoded_foo(r) {
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104 return encodeURIComponent('foo &amp; bar?');
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105 }
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106
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107 export default {encoded_foo};
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108 </example>
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109 </para>
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110
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111 </section>
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112
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113
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114 <section id="redirect" name="Internal Redirect">
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115
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116 <para>
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117 <path>nginx.conf</path>:
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118 <example>
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119 js_import http.js;
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120
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121 location /redirect {
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122 js_content http.redirect;
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123 }
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124
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125 location @named {
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126 return 200 named;
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127 }
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128 </example>
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129 </para>
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130
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131 <para>
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132 <path>http.js</path>:
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133 <example>
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134 function redirect(r) {
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135 r.internalRedirect('@named');
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136 }
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137
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138 export default {redirect};
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139 </example>
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140 </para>
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141
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142 </section>
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143
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144
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145 <section id="fast_response" name="Returning Fastest Response from Proxy">
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146
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147 <para>
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148 <path>nginx.conf</path>:
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149 <example>
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150 js_import http.js;
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151
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152 location /start {
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153 js_content http.content;
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154 }
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155
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156 location /foo {
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157 proxy_pass http://backend1;
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158 }
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159
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160 location /bar {
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161 proxy_pass http://backend2;
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162 }
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163 </example>
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164 </para>
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165
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166 <para>
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167 <path>http.js</path>:
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168 <example>
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169 function content(r) {
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170 var n = 0;
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171
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172 function done(res) {
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173 if (n++ == 0) {
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174 r.return(res.status, res.responseBody);
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175 }
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176 }
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177
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178 r.subrequest('/foo', r.variables.args, done);
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179 r.subrequest('/bar', r.variables.args, done);
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180 }
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181
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182 export default {content};
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183 </example>
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184 </para>
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185
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186 </section>
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187
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188
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189 <section id="jwt" name="Creating HS JWT">
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190
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191 <para>
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192 <path>nginx.conf</path>:
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193 <example>
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194 js_import http.js;
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195
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196 js_set $jwt http.jwt;
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197 </example>
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198 </para>
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199
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200 <para>
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201 <path>http.js</path>:
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202 <example>
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203 function generate_hs256_jwt(claims, key, valid) {
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204 var header = { typ: "JWT", alg: "HS256" };
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205 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid});
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206
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207 var s = [header, claims].map(JSON.stringify)
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208 .map(v=>v.toString('base64url'))
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209 .join('.');
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210
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211 var h = require('crypto').createHmac('sha256', key);
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212
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213 return s + '.' + h.update(s).digest('base64url');
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214 }
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215
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216 function jwt(r) {
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217 var claims = {
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218 iss: "nginx",
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219 sub: "alice",
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220 foo: 123,
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221 bar: "qq",
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222 zyx: false
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223 };
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224
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225 return generate_hs256_jwt(claims, 'foo', 600);
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226 }
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227
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228 export default {jwt};
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229 </example>
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230 </para>
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231
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232 </section>
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233
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234
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235 <section id="jwt_field" name="Getting Arbitrary Field from JWT
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236 as nginx Variable">
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237
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238 <para>
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239 <path>nginx.conf</path>:
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240 <example>
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241 js_import http.js;
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242
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243 js_set $jwt_payload_sub main.jwt_payload_sub;
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244
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245 server {
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246 ...
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247
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248 location /jwt {
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249 return 200 $jwt_payload_sub;
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250 }
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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 jwt(data) {
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259 var parts = data.split('.').slice(0,2)
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260 .map(v=>Buffer.from(v, 'base64url').toString())
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261 .map(JSON.parse);
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262 return { headers:parts[0], payload: parts[1] };
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263 }
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264
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265 function jwt_payload_sub(r) {
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266 return jwt(r.headersIn.Authorization.slice(7)).payload.sub;
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267 }
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268
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269 export default {jwt_payload_sub}
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270 </example>
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271 </para>
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272
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273 </section>
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274
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275
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276 <section id="subrequest" name="Accessing API from a Subrequest">
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277
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278 <para>
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279 <path>nginx.conf</path>:
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280 <example>
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281 js_import http.js;
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282
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283 keyval_zone zone=foo:10m;
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284 ...
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285
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286 location /keyval {
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287 js_content http.set_keyval;
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288 }
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289
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290 location /version {
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291 js_content http.version;
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292 }
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293
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294 location /api {
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295 api write=on;
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296 }
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297 </example>
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298 </para>
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299
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300 <para>
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301 <path>http.js</path>:
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302 <example>
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303 function set_keyval(r) {
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304 r.subrequest('/api/5/http/keyvals/foo',
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305 { method: 'POST',
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306 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })},
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307
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308 function(res) {
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309 if (res.status >= 300) {
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310 r.return(res.status, res.responseBody);
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311 return;
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312 }
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313 r.return(500);
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314 });
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315 }
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316
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317 function version(r) {
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318 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) {
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319 if (res.status != 200) {
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320 r.return(res.status);
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321 return;
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322 }
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323
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324 var json = JSON.parse(res.responseBody);
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325 r.return(200, json.version);
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326 });
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327 }
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328
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329 export default {set_keyval, version};
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330 </example>
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331 </para>
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332
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333 </section>
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334
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335
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336 <section id="secure_link" name="Creating secure_link Hash">
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337
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338 <para>
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339 <path>nginx.conf</path>:
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340 <example>
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341 js_import http.js;
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342
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343 js_set $new_foo http.create_secure_link;
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344 ...
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345
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346 location / {
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347 secure_link $cookie_foo;
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348 secure_link_md5 "$uri mykey";
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349 ...
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350 }
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351
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352 location @login {
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353 add_header Set-Cookie "foo=$new_foo; Max-Age=60";
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354 return 302 /;
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355 }
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356 </example>
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357 </para>
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358
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359 <para>
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360 <path>http.js</path>:
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361 <example>
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362 function create_secure_link(r) {
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363 return require('crypto').createHash('md5')
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364 .update(r.uri).update(" mykey")
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365 .digest('base64url');
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366 }
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367
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368 export default {create_secure_link};
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369 </example>
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370 </para>
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371
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372 </section>
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373
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374
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375 <section id="requests" name="Logging the Number of Requests Per Client">
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376
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377 <para>
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378 <path>nginx.conf</path>:
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379 <example>
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380 js_import http.js;
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381
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382 js_set $num_requests http.num_requests;
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383
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384 keyval_zone zone=foo:10m;
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385
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386 keyval $remote_addr $foo zone=foo;
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387
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388 log_format bar '$remote_addr [$time_local] $num_requests';
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389 access_log logs/access.log bar;
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390
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391 server {
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392 listen 8000;
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393
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394 location / {
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395 root html;
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396 }
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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 num_requests(r)
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405 {
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406 var n = r.variables.foo;
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407 n = n ? Number(n) + 1 : 1;
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408 r.variables.foo = n;
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409 return n;
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410 }
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411
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412 export default {num_requests};
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413 </example>
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414 <note>
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415 The <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> and
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416 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> directives
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417 are available as part of our
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418 <commercial_version>commercial subscription</commercial_version>.
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419 </note>
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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
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425 <section id="subrequests_chaining" name="Subrequests Chaining">
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426
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427 <para>
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428 <path>nginx.conf</path>:
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429 <example>
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430 js_import http.js;
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431
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432 location /start {
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433 js_content http.content;
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434 }
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435
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436 location /auth {
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437 proxy_pass http://auth_backend;
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438 }
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439
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440 location /backend {
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441 proxy_pass http://backend;
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442 }
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443 </example>
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444 </para>
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445
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446 <para>
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447 <path>http.js</path>:
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448 <example>
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449 function content(r) {
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450 r.subrequest('/auth')
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451 .then(reply => JSON.parse(reply.responseBody))
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452 .then(response => {
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453 if (!response['token']) {
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454 throw new Error("token is not available");
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455 }
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456 return reply['token'];
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457 })
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458 .then(token => {
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459 r.subrequest('/backend', `token=${token}`)
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460 .then(reply => r.return(reply.status, reply.responseBody));
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461 })
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462 .catch(_ => r.return(500));
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463 }
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464
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465 export default {content};
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466 </example>
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467 </para>
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468
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469 </section>
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470
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471 </article>