Can't read file in GoLang - go

Question

I am new to GoLang dev and am trying to make a simple web-app. I have been following this tutorial https://www.youtube.com/watch?v=AiRhWG-2nGU.
However I can not even serve the index.html file.
This is my code
func check(e error) {
if e != nil {
fmt.Println(e)
panic(e)
}
}
func Index(w http.ResponseWriter, r *http.Request) {
fmt.Println("Index functoin")
indexHTML, err := ioutil.ReadFile("index.html")
check(err)
fmt.Println(indexHTML)
w.Write(indexHTML)
}
and this is the error produced
Index functoin
open index.html: no such file or directory
My tree structure is like so
BasicWebServer/
BasicWebServer/main.go
BasicWebServer/index.html
BasicWebServer/static/
BasicWebServer/static/index.html
All I want is to be able to serve the index.html since it is a AngularJS app which is already running smoothly. I tried with static files like so
router := NewRouter()
s := http.StripPrefix("/static/", http.FileServer(http.Dir("./static/")))
but it did not work so I am now trying the most basic approach I could think of.
Please help.
Thank you

Answer 1

If you want BasicWebServer/main.go to show BasicWebServer/index.html, not the one inside the static folder, then it seems you didn't properly configure the HTTP server.
Here's your code, with package declaration, imports and a main function working as you expected.
package main
import (
"fmt"
"io/ioutil"
"net/http"
)
func check(e error) {
if e != nil {
fmt.Println(e)
panic(e)
}
}
func Index(w http.ResponseWriter, r *http.Request) {
fmt.Println("Index functoin")
indexHTML, err := ioutil.ReadFile("index.html")
check(err)
fmt.Println(indexHTML)
w.Write(indexHTML)
}
func main() {
http.HandleFunc("/", Index)
err := http.ListenAndServe(":8080", nil)
check(err)
}