add resToRawResultFn in API GW

Author: KSDaemon

packages/cubejs-api-gateway/src/gateway.ts

@@ -1983,6 +1983,17 @@ class ApiGateway {
     return (message, { status }: { status?: number } = {}) => (status ? res.status(status).json(message) : res.json(message));
   }
 
+  protected resToRawResultFn(res: ExpressResponse) {
+    return (jsonBuffer: ArrayBuffer, { status }: { status?: number } = {}) => {
+      if (status) {
+        res.status(status)
+      }
+
+      res.set('Content-Type', 'application/json');
+      res.send(jsonBuffer);
+    };
+  }
+
   protected parseQueryParam(query): Query | Query[] {
     if (!query || query === 'undefined') {
       throw new UserError('Query param is required');