Nothing to really see in these forum posts aside from at best what I can gather is, I'm right, your wrong and you should be thanking me for pointing this out.

Nothing to really see in these forum posts aside from at best what I can gather is, I'm right, your wrong and you should be thanking me for pointing this out. Poster made their valid point about vary headers & Cloudflare responded stating it isn't a bug and it is their intended behavior. Forum poster continues along the lines of, "I want to use this service but this service needs to conform to the specification and nothing less." They're not matching the specification, they're aware and they admit it. Move providers if you require this or run your own.