ws: go http server

.gitignore

@@ -0,0 +1 @@
+/ws/ws

README.md

@@ -46,20 +46,11 @@ Lightpanda browser, but the code is not publicly available yet.
 Clone the [demo web page](https://github.com/lightpanda-io/demo) and expose the
 `public/` directory locally with a web server.
 
-We use a simple Go program to expose the files.
+We use the simple Go program to expose the files in `ws/` dir.
+By default it exposes the `public` dir using the `1234` port.
 
-```go
-package main
-
-import (
-	"log"
-	"net/http"
-)
-
-func main() {
-	// Simple static webserver:
-	log.Fatal(http.ListenAndServe(":1234", http.FileServer(http.Dir(""))))
-}
+```console
+$ go run ws/main.go
 ```
 
 ## Single request

ws/go.mod

@@ -0,0 +1,3 @@
+module github.com/lightpanda-io/demo/ws
+
+go 1.22.1

ws/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	address := os.Getenv("WS_ADDRESS")
+	if address == "" {
+		address = ":1234"
+	}
+
+	dir := os.Getenv("WS_DIR")
+	if dir == "" {
+		dir = "public"
+	}
+
+	fmt.Fprintf(os.Stderr, "expose dir: %q\nlisten: %q\n", dir, address)
+
+	// Simple static webserver:
+	log.Fatal(http.ListenAndServe(address, http.FileServer(http.Dir(dir))))
+}