[issue-#324-execute-middleware-for-static-assets] pass in error.code …

…and error.message (default to 404 error code)

src/http/server.ts

@@ -444,7 +444,7 @@ export class Server {
     } catch (error) {
       return await this.handleHttpRequestError(
         request,
-        this.httpErrorResponse(404),
+        this.httpErrorResponse(error.code ?? 404, error.message),
       );
     }
   }