golang 一个简单web 自动加载项目依赖

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package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)
func sayhello(w http.ResponseWriter,r *http.Request){
	b,_ := ioutil.ReadFile("./hello.txt")
	_,_ = fmt.Fprintf(w,string(b))
}
func main(){
	http.HandleFunc("/hello",sayhello)
	err := http.ListenAndServe(":9090",nil)
	if err !=nil{
		fmt.Printf("http.listen%v\n",err)
		return
	}
}

go mod tidy   自动加载项目依赖