How to fix the output?

Question

go

Here I read the content of the file and run it through the built-in template engine. The error is that when you enter from the browser, instead of displaying something on the screen, it displays it in the console.
Own code

package main

import (
  "net/http"
  "io/ioutil"
    "html/template"
    "os"
    "fmt"
)

func hello(res http.ResponseWriter, req *http.Request) {
    	
  bs, err := ioutil.ReadFile("TestPage.txt")
    if err != nil {
        return
    }
    str := string(bs)
    t := template.New("Test Template")       
    t, _ = t.Parse(str)  
    
    p:= map[string]string{
    "H": "Hydrogen",
    "He": "Helium",
    }
    
    template := t.Execute(os.Stdout, p) ////По моему ошибка в этой строке. Но как исправить незнаю.
    
    res.Header().Set(
        "Content-Type", 
        "text/html",
    )
     fmt.Println(template)
    
}


func main() {
      
    http.HandleFunc("/hello", hello)
    http.ListenAndServe(":8080", nil)
}

Answer 1

template.Execute() - this function writes where you need. You give the first argument where to write, the second what data is available in the template. Those. we send http.ResponseWriter to it, and the second is your mapping "p".

package main

import (
  "html/template"
  "io/ioutil"
  "net/http"
)

func hello(res http.ResponseWriter, req *http.Request) {

  bs, err := ioutil.ReadFile("TestPage.txt")
  if err != nil {
    return
  }
  str := string(bs)
  t := template.New("Test Template")
  t, _ = t.Parse(str)

  p := map[string]string{
    "H":  "Hydrogen",
    "He": "Helium",
  }

  res.Header().Set(
    "Content-Type",
    "text/html",
  )
  t.Execute(res, p)

}

func main() {

  http.HandleFunc("/hello", hello)
  http.ListenAndServe(":8080", nil)
}