Go入门到精通系列

>go version
go version go1.17.7 windows

go install -v github.com/uudashr/gopkgs/v2/cmd/gopkgs@latest

go mod init example/hello

go env -w GOPROXY=https://goproxy.cn

package main

import (
    //echo是Go的web开发框架
    "github.com/labstack/echo/v4"
    "github.com/labstack/echo/v4/middleware"
    "net/http"
)

func main() {
    // Echo instance
    e := echo.New()
    // Middleware
    e.Use(middleware.Logger())
    e.Use(middleware.Recover())
    // Routes
    e.GET("/", hello)
    // Start server
    e.Logger.Fatal(e.Start(":1323"))
}

// Handler
func hello(c echo.Context) error {
    return c.String(http.StatusOK, "Hello, World!")
}

go run server.go

server.go:4:3: no required module provides package github.com/labstack/echo/v4; to add it:
        go get github.com/labstack/echo/v4
server.go:5:3: no required module provides package github.com/labstack/echo/v4/middleware; to add it:
        go get github.com/labstack/echo/v4/middleware

go get github.com/labstack/echo/v4
go get github.com/labstack/echo/v4/middleware