创建gomod项目

go mod init web01

新建main.go

package main

import (
	"fmt"
	"net/http"
)

func handler(writer http.ResponseWriter, request *http.Request) {
	fmt.Fprintf(writer, "Hello World,%s!", request.URL.Path[1:])
}
func main() {
	fmt.Println("http:127.0.0.1:8080")
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8080", nil)
}

创建launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch Package",
            "type": "go",
            "request": "launch",
            "mode": "auto",
            "program": "${fileDirname}"
        }
    ]
}

启动项目访问http://127.0.0.1:8080/