how to test
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please install go first,
if you are in windows cmd

    go mod init gogo
    go mod tidy 
    go build -o gogo.exe main\main.go
    .\gogo.exe -build -port 8081

or linux 

    go mod init gogo
    go mod tidy # maybe you can skip this
    go build -o gogo main/main.go
    ./gogo -port 8081 -build

api
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2. /doit

post a json {x:1,y:1,uid:1}

3. /getall?x1=1&x2=2&y1=1&y2=2

get all zi in a rect

speed
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load 1826657 entries in 8.64s on a Win10 Surface