WebHCat uses AuthFilter to handle authentication. In simple mode that means using PseudoAuthenticationHandler. Prior to
HADOOP-10193, the latter handled user.name as form parameter in a POST request. Now it only handles it as a query parameter.
to maintain webhcat backwards compat, we need to make WebHCat still extract it from form param. This will be deprecated immediately and removed in 0.15
Also, all examples in WebHCat reference manual should be updated to use user.name in query string from current form param (curl -d user.name=foo)