Cache vary user-agent config is to enable the CE to cache the content that varies
based on the User-agent alone. ( introduced in 5.1 ) . Before that the CE wont cache
any content that has the vary header in the response. The risk involved , addtional
check will be done in the cache for all the request . Benefit - able to cache the
content that vary with user-agent.
For more details on Vary header, read HTTP related RFCs.
Syed Iftekhar Ahmed
Syed Iftekhar Ahmed