Mercurial > hg > nginx-site
annotate xml/en/docs/njs/examples.xml @ 2933:386ba17fac23
Documented Request, Response, Headers in Fetch API.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 02 Feb 2023 14:06:03 +0000 |
parents | 24b379907b0f |
children | 9eadb98ec770 |
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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="21"> |
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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="http_auth" name="HTTP Аuthorization"> |
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60 |
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61 |
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62 <section id="jwt" name="Creating HS JWT"> |
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63 |
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64 <para> |
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65 <path>nginx.conf</path>: |
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66 <example> |
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67 js_import http.js; |
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68 |
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69 js_set $jwt http.jwt; |
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70 </example> |
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71 </para> |
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72 |
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73 <para> |
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74 <path>http.js</path>: |
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75 <example> |
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76 function generate_hs256_jwt(claims, key, valid) { |
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77 var header = { typ: "JWT", alg: "HS256" }; |
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78 var claims = Object.assign(claims, {exp: Math.floor(Date.now()/1000) + valid}); |
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79 |
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80 var s = [header, claims].map(JSON.stringify) |
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81 .map(v=>v.toString('base64url')) |
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82 .join('.'); |
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83 |
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84 var h = require('crypto').createHmac('sha256', key); |
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85 |
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86 return s + '.' + h.update(s).digest('base64url'); |
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87 } |
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88 |
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89 function jwt(r) { |
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90 var claims = { |
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91 iss: "nginx", |
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92 sub: "alice", |
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93 foo: 123, |
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94 bar: "qq", |
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95 zyx: false |
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96 }; |
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97 |
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98 return generate_hs256_jwt(claims, 'foo', 600); |
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99 } |
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100 |
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101 export default {jwt}; |
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102 </example> |
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103 </para> |
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104 |
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105 </section> |
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106 |
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107 |
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108 <section id="secure_link" name="Creating secure_link Hash"> |
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109 |
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110 <para> |
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111 <path>nginx.conf</path>: |
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112 <example> |
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113 js_import http.js; |
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114 |
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115 js_set $new_foo http.create_secure_link; |
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116 #... |
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117 |
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118 location / { |
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119 secure_link $cookie_foo; |
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120 secure_link_md5 "$uri mykey"; |
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121 # |
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122 } |
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123 |
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124 location @login { |
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125 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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126 return 302 /; |
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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 create_secure_link(r) { |
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135 return require('crypto').createHash('md5') |
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136 .update(r.uri).update(" mykey") |
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137 .digest('base64url'); |
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138 } |
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139 |
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140 export default {create_secure_link}; |
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141 </example> |
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142 </para> |
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143 |
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144 </section> |
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145 |
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146 |
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147 <section id="jwt_field" name="Getting Arbitrary Field from JWT |
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148 as nginx Variable"> |
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149 |
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150 <para> |
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151 In the following example, the <literal>sub</literal> field |
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152 is extracted from JWT payload. |
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153 The JWT token is taken from the <header>Authorization</header> header. |
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154 </para> |
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155 |
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156 <para> |
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157 <path>nginx.conf</path>: |
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158 <example> |
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159 js_import http.js; |
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160 |
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161 js_set $jwt_payload_sub http.jwt_payload_sub; |
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162 |
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163 server { |
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164 #... |
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165 |
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166 location /jwt { |
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167 return 200 $jwt_payload_sub; |
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168 } |
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169 } |
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170 </example> |
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171 </para> |
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172 |
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173 <para> |
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174 <path>http.js</path>: |
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175 <example> |
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176 function jwt(data) { |
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177 var parts = data.split('.').slice(0,2) |
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178 .map(v=>Buffer.from(v, 'base64url').toString()) |
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179 .map(JSON.parse); |
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180 return { headers:parts[0], payload: parts[1] }; |
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181 } |
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182 |
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183 function jwt_payload_sub(r) { |
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184 return jwt(r.headersIn.Authorization.slice(7)).payload.sub; |
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185 // when the token is provided as the "myjwt" argument |
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186 // return jwt(r.args.myjwt).payload.sub; |
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187 } |
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188 |
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189 export default {jwt_payload_sub}; |
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190 </example> |
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191 </para> |
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192 |
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193 </section> |
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194 |
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195 </section> |
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196 |
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197 |
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198 <section id="http_proxying" name="HTTP Proxying"> |
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199 |
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200 |
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201 <section id="subrequest" name="Accessing API from a Subrequest"> |
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202 |
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203 <para> |
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204 <path>nginx.conf</path>: |
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205 <example> |
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206 js_import http.js; |
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207 |
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208 keyval_zone zone=foo:10m; |
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209 #... |
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210 |
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211 location /keyval { |
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212 js_content http.set_keyval; |
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213 } |
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214 |
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215 location /version { |
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216 js_content http.version; |
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217 } |
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218 |
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219 location /api { |
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220 api write=on; |
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221 } |
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222 </example> |
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223 </para> |
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224 |
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225 <para> |
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226 <path>http.js</path>: |
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227 <example> |
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228 async function set_keyval(r) { |
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229 let res = await r.subrequest('/api/7/http/keyvals/foo', |
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230 { method: 'POST', |
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231 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}); |
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232 |
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233 if (res.status >= 300) { |
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234 r.return(res.status, res.responseBody); |
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235 return; |
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236 } |
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237 |
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238 r.return(200); |
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239 } |
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240 |
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241 async function version(r) { |
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242 let res = await r.subrequest('/api/7/nginx', { method: 'GET' }); |
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243 |
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244 if (res.status != 200) { |
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245 r.return(res.status); |
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246 return; |
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247 } |
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248 |
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249 var json = JSON.parse(res.responseBody); |
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250 r.return(200, json.version); |
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251 } |
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252 |
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253 export default {set_keyval, version}; |
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254 </example> |
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255 <note> |
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256 The <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/>, |
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257 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/>, |
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258 and <link doc="../http/ngx_http_api_module.xml" id="api"/> directives |
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259 are available as part of our |
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260 <commercial_version>commercial subscription</commercial_version>. |
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261 </note> |
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262 </para> |
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263 |
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264 </section> |
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265 |
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266 |
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267 <section id="fast_response" name="Returning Fastest Response from Proxy"> |
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268 |
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269 <para> |
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270 <path>nginx.conf</path>: |
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271 <example> |
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272 js_import http.js; |
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273 |
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274 location /start { |
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275 js_content http.content; |
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276 } |
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277 |
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278 location /foo { |
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279 proxy_pass http://backend1; |
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280 } |
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281 |
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282 location /bar { |
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283 proxy_pass http://backend2; |
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284 } |
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285 </example> |
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286 </para> |
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287 |
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288 <para> |
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289 <path>http.js</path>: |
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290 <example> |
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291 function content(r) { |
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292 var n = 0; |
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293 |
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294 function done(res) { |
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295 if (n++ == 0) { |
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296 r.return(res.status, res.responseBody); |
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297 } |
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298 } |
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299 |
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300 r.subrequest('/foo', r.variables.args, done); |
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301 r.subrequest('/bar', r.variables.args, done); |
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302 } |
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303 |
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304 export default {content}; |
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305 </example> |
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306 </para> |
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307 |
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308 </section> |
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309 |
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310 |
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311 <section id="subrequests_chaining" name="Subrequests Chaining"> |
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312 |
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313 <para> |
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314 <path>nginx.conf</path>: |
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315 <example> |
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316 js_import http.js; |
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317 |
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318 location /start { |
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319 js_content http.content; |
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320 } |
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321 |
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322 location /auth { |
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323 proxy_pass http://auth_backend; |
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324 } |
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325 |
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326 location /backend { |
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327 proxy_pass http://backend; |
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328 } |
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329 </example> |
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330 </para> |
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331 |
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332 <para> |
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333 <path>http.js</path>: |
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334 <example> |
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335 async function content(r) { |
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336 try { |
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337 let reply = await r.subrequest('/auth'); |
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338 let response = JSON.parse(reply.responseBody); |
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339 let token = response['token']; |
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340 |
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341 if (!token) { |
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342 throw new Error("token is not available"); |
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343 } |
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344 |
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345 let backend_reply = await r.subrequest('/backend', `token=${token}`); |
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346 r.return(backend_reply.status, backend_reply.responseBody); |
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347 |
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348 } catch (e) { |
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349 r.error(e); |
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350 r.return(500); |
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351 } |
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352 } |
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353 |
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354 export default {content}; |
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355 </example> |
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356 </para> |
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357 |
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358 </section> |
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359 |
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360 </section> |
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361 |
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362 |
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363 <section id="misc" name="Miscellaneous"> |
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364 |
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365 |
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366 <section id="redirect" name="Internal Redirect"> |
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367 |
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368 <para> |
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369 <path>nginx.conf</path>: |
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370 <example> |
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371 js_import http.js; |
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372 |
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373 location /redirect { |
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374 js_content http.redirect; |
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375 } |
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376 |
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377 location @named { |
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378 return 200 named; |
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379 } |
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380 </example> |
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381 </para> |
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382 |
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383 <para> |
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384 <path>http.js</path>: |
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385 <example> |
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386 function redirect(r) { |
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387 r.internalRedirect('@named'); |
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388 } |
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389 |
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390 export default {redirect}; |
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391 </example> |
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392 </para> |
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393 |
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394 </section> |
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395 |
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396 |
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397 <section id="requests" name="Logging the Number of Requests Per Client"> |
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398 |
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399 <para> |
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400 <path>nginx.conf</path>: |
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401 <example> |
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402 js_import http.js; |
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403 |
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404 js_set $num_requests http.num_requests; |
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405 |
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406 keyval_zone zone=foo:10m; |
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407 |
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408 keyval $remote_addr $foo zone=foo; |
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409 |
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410 log_format bar '$remote_addr [$time_local] $num_requests'; |
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411 access_log logs/access.log bar; |
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412 |
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413 server { |
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414 listen 8000; |
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415 |
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416 location / { |
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417 root html; |
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418 } |
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419 } |
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420 </example> |
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421 </para> |
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422 |
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423 <para> |
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424 <path>http.js</path>: |
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425 <example> |
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426 function num_requests(r) |
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427 { |
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428 var n = r.variables.foo; |
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429 n = n ? Number(n) + 1 : 1; |
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430 r.variables.foo = n; |
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431 return n; |
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432 } |
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433 |
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434 export default {num_requests}; |
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435 </example> |
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436 <note> |
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437 The <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> and |
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438 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> directives |
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439 are available as part of our |
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440 <commercial_version>commercial subscription</commercial_version>. |
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441 </note> |
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442 </para> |
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443 |
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444 </section> |
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445 |
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446 </section> |
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447 |
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448 </article> |