{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Because of business needs , To do the gray release test , I just started to think about passing IP To make a judgment , Distribute different back ends , But because of IP Not sure , Some clients IP Unfixed , So consider using cookie To do it ","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" The logic is simple , Here's the picture ：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/0b/0bdabe41ef0a71e3d1d2917d4a05ae0e.png","alt":" picture ","title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" stay nginx It's easy to do this , Two methods ,map or if","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" First of all to see map How do you do it? 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","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"map The main function of is to create custom variables , Mapping variables , The value of the variable depends on the value of one or more source variables specified by the first parameter ","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" How do you understand that , Take the configuration case of the official website above as an example ,$http_host Map the first column example.com etc. , That's the first parameter ,$name Map the second column 0、1 etc. , That's the second parameter , When $http_host The value is example.com when ,$name The value is 1, And so on , If it doesn't match , That's it default Value , If there is no definition default, That's empty 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