Use of Go net/http and io/ioutil packages

tips:
This is probably the easiest web backend development demo

Create a main.go in goland and follow the instructions of the http package to write the code as follows:

 package main

import (
    "fmt"
    "net/http"
)
func sayhello(w http.ResponseWriter, r *http.Request) {
    _, _ = fmt.Fprint(w, "<h1>hey this is LIBERHOME!</h1>")
}

func main() {
    http.HandleFunc("/hello", sayhello)
    err := http.ListenAndServe(":9090", nil) //服务器启动后，监听9090端口
    if err != nil {
        fmt.Printf("http service failed, err: %v\n", err)
        return
    }
}

Then execute it in the terminal
go run main.go
Then type in the browser
http://127.0.0.1:9090/hello
to see

---

Of course, directly hardcoding the content displayed on the web page can be changed to a txt file:
First create a hello.txt:

 <h1>hey it is LIBERHOME!</h1>
<h2>this may be the most simple demo~</h2>
<img id='i1' src='https://avatar-static.segmentfault.com/274/037/2740371703-61baf9dec42e4_huge256'>

Then the previous code is slightly modified and added to the ioutil package:

 package main
import (
    "fmt"
    "io/ioutil"
    "net/http"
)
func sayhello(w http.ResponseWriter, r *http.Request) {
    b, _ := ioutil.ReadFile("./hello.txt")
    _, _ = fmt.Fprint(w, string(b))
}
func main() {
    http.HandleFunc("/hello", sayhello)
    err := http.ListenAndServe(":9090", nil) //服务器启动后， 监听9090端口
    if err != nil {
        fmt.Printf("http service failed, err: %v\n", err)
        return
    }
}

The results are as follows:

Reference: bilibili