Simple Golang-Server for serving Godot-Web-Exports locally (Needed for Godot 4.0)

server.go

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    fs := http.FileServer(http.Dir("./"))
    http.Handle("/", addHeaders(fs))

    fmt.Printf("Server started at port 4567")
    err := http.ListenAndServe(":4567", nil)
    if err == nil {
        log.Fatal(err)
    }
}

func addHeaders(fs http.Handler) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        w.Header().Add("X-Frame-Options", "DENY")
        w.Header().Add("Cross-Origin-Opener-Policy", "same-origin")
        w.Header().Add("Cross-Origin-Embedder-Policy", "require-corp")
        w.Header().Add("Cross-Origin-Resource-Policy", "cross-origin")
        fs.ServeHTTP(w, r)
    }
}