Download (remember not to use brew, brew will fail many times inexplicably)
Download go address: https://golang.google.cn/dl/
After downloading, double-click to install the pkg package to enter the automatic installation
After the installation is complete, check the version go version
View configuration go env
Start downloading the gin framework
go get -u github.com/gin-gonic/gin
go run main.go prompts that the current directory cannot find go.mod
to create a go module, use go mod init + package name
However, the download of the gin framework always reports an error, and the download is unsuccessful. You need to set up a proxy. First, enable the go module support
Modify the env configuration
go env -w GO111MODULE=auto
go env -w GOPROXY=https://goproxy.cn,direct
After downloading the startup project, an error is reported
Download library dependencies (packages not found in the error report must be downloaded again)
git clone https://github.com/protocolbuffers/protobuf-go.git
git clone https://github.com/golang/tools.git 
git clone https://github.com/golang/crypto.git
git clone https://github.com/go-playground/locales.git
git clone https://github.com/golang/net.git
git clone https://github.com/golang/text.git
git clone https://github.com/leodido/go-urn.git
git clone https://github.com/pelletier/go-toml.git
Focus on explaining sse and sys download problem 
1. sse problem
cd /Users/macuser/go/src/github.com/gin-contrib
If you encounter the above problem, remember to switch the directory first, and then download
cd /Users/macuser/go/src/golang.org/x
After the download is successful, just move the mov to the specified directory
mv /Users/macuser/go/src/golang.org/x /Users/macuser/go/src/github.com/gin-contrib
Two.sys problem
cd /Users/macuser/go/src/golang.org/x
git clone https://github.com/golang/sys.git
last entered project
runs successfully and outputs the browser
