Can we control the "request header size"?

We have a number of companies that resale our courses on their own LMS. For the most part, they work fine as published with very little issues. But one of our larger customers is having issues. When they try to play our courses they get an error stating that the "request header size is too big." More specifically, they said: "This error occurs when request header for suspend data sends a parameter that exceeds 5500 characters. The increase in request header size can increase potential of security threats."

Now, I am not entirely sure what a request header is. Is that the address that displays in a browser when the course is recalled?

More importantly, does anyone know if this is something we can control through Captivate? Or is that something their system creates and the error is because their server or something is set to block the long domain? The customer doesn't seem to know or, at least, seems to think it is something I need to change on our course.

Any thoughts would be appreciated. I'm kind of at a loss. Thanks in advance!

Best,

Arthur