I recently migrated an ASP site from my dev machine to a live server. All the pages except my FAQ page works just fine, but my FAQ brings up:
XML Parsing Er
I was facing the same issue. My solution may not apply to ASP.NET, I am working in node/express land. My API endpoint was not returning any data in the response:
return res.status(200).end();
When I included something in the data response it resolved the issue:
return res.status(200).send('ok').end();