Hi,
     What is the best way to get a method to return 428 Precondition 
Required as mentioned here? 
http://tools.ietf.org/html/rfc6585#section-3
     I know I can inject HttpHeaders, parse them for the relevant 
headers and return 428 on failure but I'm wondering if Jersey has an 
existing mechanism that will do all this for me? Is there something like 
Request.evaluatePreconditions() for requiring preconditions? If not, 
could we add Request.requirePreconditions()?
Thanks,
Gili