Avoid the trap! Pitfalls encountered during Gin installation

This article is introduced to you by the go language tutorial column. The theme is about the pitfalls encountered in Gin installation. I hope it will be helpful to friends in need!

                                                                                                               

Gin initial installation

1. Install the official document execution
go get -u github.com/gin-gonic/gin

Because I can't circumvent the wall, Baidu said to use gopm to solve it. Friends in the group said that this kind of experiment has long been outdated, and now they use go mod to solve it.
So start go mod

go env -w GOBIN=/Users/youdi/go/bin
go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.cn,direct // 使用七牛云的

Use go mod to manage a new project

mkdir Gone
cd Gone
go mod init Gone

Check the go.mod file

module Gone

go 1.16

Once the go.mod file is created , its content will be fully controlled by the go toolchain. The go toolchain will modify and maintain the go.mod file when various commands are executed, such as go get, go build, go mod, etc.

go.mod provides four commands: module, require, replace and exclude

• module The statement specifies the name (path) of the package
• require The dependency module specified by the statement
• replace The statement can replace the dependency module
• exclude The statement can ignore the dependency Item module

package mainimport (
    "github.com/gin-gonic/gin")func main() {
    r := gin.Default()
    r.GET("/ping", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "pong",
        })
    })
    r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")}

Execute go run main.go. When running the code, you will find that go mod will automatically find dependencies and automatically download
The result is an error

main.go:3:8: no required module provides package github.com/gin-gonic/gin; to add it:
        go get github.com/gin-gonic/gin

Execute: go mod edit -require github .com/gin-gonic/gin@latest Solution, specify the Gin version
Run go run main.go again and report an error

go: github.com/gin-gonic/gin@v1.7.4: missing go.sum entry; to add it:
        go mod download github.com/gin-gonic/gin

Then execute go mod tidy and execute go run main.go again. Finally it runs.

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