ptdorf/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Go embed example of serving static files at the root URL path

This kept growing and I wanted to add some pictures, so I moved it to a blog post:
https://hakk.dev/blog/posts/go-embed-example/

  
## example.go
package main

import (
	"embed"
	"fmt"
	"io/fs"
	"log"
	"net/http"
	"os"
)

//go:embed public
var staticFiles embed.FS

func main() {

	var staticFS = fs.FS(staticFiles)
	htmlContent, err := fs.Sub(staticFS, "public")
	if err != nil {
		log.Fatal(err)
	}
	fs := http.FileServer(http.FS(htmlContent))

	// Serve static files
	http.Handle("/", fs)

	port := os.Getenv("PORT")
	if port == "" {
		port = "3000"
	}

	log.Printf("Listening on :%s...\n", port)
	err = http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
	if err != nil {
		log.Fatal(err)
	}
}

## index.html
<!doctype html>
<!-- public/index.html -->
<html lang="en">
<head>
  <meta charset="utf-8">

  <title>Go embed example</title>
  <meta name="description" content="Go embed example">
  <meta name="author" content="bmcculley">

  <link rel="stylesheet" href="css/style.css">

</head>
<body>
  <p>A Go <a href="https://golang.org/pkg/embed/">embed</a> example of serving static files at the root URL path.</p>
</body>
</html>

## main.go
package main

import (
	"embed"
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"
)

//go:embed public
var staticFiles embed.FS

var staticDir = "public"

func rootPath(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// add header(s)
		w.Header().Set("Cache-Control", "no-cache")

		if r.URL.Path == "/" {
			r.URL.Path = fmt.Sprintf("/%s/", staticDir)
		} else {
			b := strings.Split(r.URL.Path, "/")[0]
			if b != staticDir {
				r.URL.Path = fmt.Sprintf("/%s%s", staticDir, r.URL.Path)
			}
		}
		h.ServeHTTP(w, r)
	})
}

func main() {

	var staticFS = http.FS(staticFiles)
	fs := rootPath(http.FileServer(staticFS))

	// Serve static files
	http.Handle("/", fs)

	port := os.Getenv("PORT")
	if port == "" {
		port = "3000"
	}

	log.Printf("Listening on :%s...\n", port)
	err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
	if err != nil {
		log.Fatal(err)
	}
}

## style.css
/* public/css/style.css */
body {
    margin: 20px;
    font-family: sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  }
	package main

	import (
	"embed"
	"fmt"
	"io/fs"
	"log"
	"net/http"
	"os"
	)

	//go:embed public
	var staticFiles embed.FS

	func main() {

	var staticFS = fs.FS(staticFiles)
	htmlContent, err := fs.Sub(staticFS, "public")
	if err != nil {
	log.Fatal(err)
	}
	fs := http.FileServer(http.FS(htmlContent))

	// Serve static files
	http.Handle("/", fs)

	port := os.Getenv("PORT")
	if port == "" {
	port = "3000"
	}

	log.Printf("Listening on :%s...\n", port)
	err = http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
	if err != nil {
	log.Fatal(err)
	}
	}
	<!doctype html>
	<!-- public/index.html -->
	<html lang="en">
	<head>
	<meta charset="utf-8">

	<title>Go embed example</title>
	<meta name="description" content="Go embed example">
	<meta name="author" content="bmcculley">

	<link rel="stylesheet" href="css/style.css">

	</head>
	<body>
	<p>A Go <a href="https://golang.org/pkg/embed/">embed</a> example of serving static files at the root URL path.</p>
	</body>
	</html>
	/* public/css/style.css */
	body {
	margin: 20px;
	font-family: sans-serif;
	font-size: 1rem;
	font-weight: 400;
	line-height: 1.5;
	color: #212529;
	background-color: #fff;
	-webkit-text-size-adjust: 100%;
	-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
	}