http HEAD vs GET performance

Question

I am setting-up a REST web service that just need to answer YES or NO, as fast as possible.

Designing a HEAD service seems the best way to do it but I would like to

Answer 1

HEAD requests are just like GET requests, except the body of the response is empty. This kind of request can be used when all you want is metadata about a file but don't need to transport all of the file's data.