SAP Build Apps REST API direct integration Error: Load failed, status -1

[rando]

I'm trying to use the REST API direct integration in SAP Build Apps.

I fill out the Resource ID and Resource URL in the BASE tab

Then turn on and fill out the Relative path in GET COLLECTION (GET) tab

But when I try to test that get collection route, I get an error (Error: TypeError: Load failed, status -1)

When sending a GET request to the same address from Postman, status is 200 OK.

What could be the cause for status -1? Is there a way to get more info out of SAP Build Apps about the error and possible causes? How to proceed from here?