Fix multiple concurrent requests issue

[pmoleri]

Fix multiple concurrent connections issue

This is easy to reproduce in the following case:

• Use Firefox
• In App Builder create a Tree
• Make the first level repeat on Northwind Swagger / Customers
• Make the second level repeat on Northwind Swagger / Customers/{id}/Orders
  (correctly link the customer id parameter)
• Go to preview
• Open the devtools
• Refresh

You can see some response errors:

With this fix there are no longer any errors.
And requests in this scenario seem to be a lot faster.

[ddidgdimitrov-infragistics]

I performed load testing on your branch, sending N simultaneous requests to an endpoint, both remotely (https://data-northwind.appbuilder.dev/) and locally. The Customers/WithOrders endpoint has the largest response size (over 300KB), while Categories is one of the smallest (under 1KB), which explains the significant difference in results between the two.

Keep in mind that these results are influenced by my network conditions and PC performance. However, overall, they indicate that the app handles concurrent requests well. Based on this, I approve the PR.

1 requests to remote /Customers/WithOrders took for 00:00:02.3621026
10 requests to remote /Customers/WithOrders took for 00:00:02.4154081
100 requests to remote /Customers/WithOrders took for 00:00:05.0389757
1000 requests to remote /Customers/WithOrders took for 00:00:25.8629290

1 requests to remote /Categories took for 00:00:00.3772586
10 requests to remote /Categories took for 00:00:00.3729161
100 requests to remote /Categories took for 00:00:00.5732582
1000 requests to remote /Categories took for 00:00:01.6273390

1 requests to local /Customers/WithOrders took for 00:00:00.0865807
10 requests to local /Customers/WithOrders took for 00:00:00.2576294
100 requests to local /Customers/WithOrders took for 00:00:01.5348999
1000 requests to local /Customers/WithOrders took for 00:00:14.3058679

1 requests to local /Categories took for 00:00:00.0557580
10 requests to local /Categories took for 00:00:00.1183388
100 requests to local /Categories took for 00:00:00.3592819
1000 requests to local /Categories took for 00:00:02.1311495