Mercurial > hg > nginx-site
annotate xml/en/docs/njs/examples.xml @ 2640:885bcb41fbcf
Added an example to njs examples.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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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 & 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> |