I have an nginx proxy node and an nginx upstream node. When I open the page in a browser, the original request is then duplicated but uses a different Accept: image/webp,*/*
header.
It's running behind Cloudflare proxy with Development mode ON
so this should make no difference. I don't see any reason why it's doing it.
First request: Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Second request: Accept: image/webp,*/*
Please see highlighted rows on the screenshot.