Fix WriteHeader order.

main.go

@@ -205,16 +205,18 @@ func clientHandler(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
+	if r.Method == http.MethodHead {
 		w.Header().Add("Content-Type", "video/MP2T")
 		w.WriteHeader(200)
-	if r.Method == http.MethodHead {
 		// Fuck you golang, you should never eat write but fail
 		return
 	}
 	if r.Method != http.MethodGet {
-		w.WriteHeader(405)
+		http.Error(w, "405 method not allowed", 405)
 		return
 	}
+	w.Header().Add("Content-Type", "video/MP2T")
+	w.WriteHeader(200)
 	ch := NewClientChannel(name)
 	defer ch.Close()
 	for {