Denis Descaus's Solution below worked for me.CORS Issue while consuming Hana's OData
I had CORS working on SPS 86 and then we moved to 96 and all the CORS requests broke.
His settings worked like a charm!
We added/replaced our ajax request attributes with the following:
contentType:"application/x-www-form-urlencoded",
xhrFields: {withCredentials: false},
headers : {"Accept" : "application/json"},