/udefined showing in Headers

When looking at some GT-Metrix reports, I am seeing /undefined appearing which is causing me to get a 404. I have spend many hours trying to fix this but have got no idea as to how.

Can anyone suggest what could be causing it please

Thank You

That comes straight from your server is not Cloudflare related I am afraid.

It seems there is one such entry and my best guess would be that is some resource loaded by JavaScript based on some invalid value.

I’d take this to StackExchange or the like.

Thank you for the quick response. I shall ask over at StackExchange

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