Simple static file web server in Go

serve.go

// Serve is a very simple static file web server in Go.
// Inspired by https://gist.github.com/paulmach/7271283
package main

import (
        "flag"
        "fmt"
        "log/slog"
        "net"
        "net/http"
        "os"
        "path/filepath"
)

var (
        path    = flag.String("path", ".", "path to the directory to serve.")
        address = flag.String("address", ":8080", "address to serve on.")
)

func main() {
        flag.Parse()

        pathAbs, err := filepath.Abs(*path)
        if err != nil {
                slog.Error("failed getting absolute path", "path", *path, "error", err)
                os.Exit(1)
        }

        err = Serve(*address, pathAbs)
        if err != nil {
                slog.Error("failed serving directory", "path", pathAbs, "address", *address, "error", err)
                os.Exit(1)
        }
}

func Serve(address string, path string) error {
        mux := http.NewServeMux()
        fs := http.FileServer(http.Dir(path))
        mux.Handle("/", logRequest(fs))

        ln, err := net.Listen("tcp", address)
        if err != nil {
                return fmt.Errorf("failed reserving TCP socket: %w", err)
        }

        slog.Info("started static file server", "path", path, "address", ln.Addr().String())

        return http.Serve(ln, mux)
}

func logRequest(handler http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
                slog.Info("request",
                        "remote_address", r.RemoteAddr,
                        "method", r.Method,
                        "url", r.URL.String(),
                )
                handler.ServeHTTP(w, r)
        })
}