fix: set http status code after defining response headers

handler.go

@@ -14,10 +14,10 @@ func Handler(handler EasyHandler) MuxHandler {
 		response := NewResponse(responseWriter)
 
 		receivedResponse := handler(request, response)
-		responseWriter.WriteHeader(receivedResponse.GetStatus())
 		for key, value := range receivedResponse.GetHeaders() {
 			responseWriter.Header().Set(key, value)
 		}
+		responseWriter.WriteHeader(receivedResponse.GetStatus())
 		responseWriter.Write([]byte(receivedResponse.GetData()))
 	}
 }