feat: add custom 404 not found handler

cmd/internal/http/server.go

@@ -8,12 +8,14 @@ import (
 	"github.com/siestaw/laterna/server/cmd/internal/db"
 	"github.com/siestaw/laterna/server/cmd/internal/logger"
 	"github.com/siestaw/laterna/server/cmd/internal/routes"
+	"github.com/siestaw/laterna/server/cmd/utils"
 )
 
 func StartHTTPServer() {
 	router := http.NewServeMux()
 	routes.RegisterColorRoutes(router)
 	routes.RegisterControllerRoutes(router)
+	router.HandleFunc("/", notFoundHandler)
 
 	if !db.ControllerExists(0) {
 		adminToken := db.CreateAdmin()
@@ -29,3 +31,7 @@ func StartHTTPServer() {
 	logger.HTTPLogger.Printf("HTTP Server running on :%v", port)
 	http.ListenAndServe(fmt.Sprintf(":%d", port), router)
 }
+
+func notFoundHandler(w http.ResponseWriter, r *http.Request) {
+	utils.ErrorResponse(w, http.StatusNotFound, "Not found")
+}