title: Allowing query strings in RegexRequestMatcher
body: <p>I am attempting to add a RegexRequestMatcher which will look for urls that have a particular url parameter and redirect requests to a custom AuthenticationEntryPoint. I am having difficulty, however, matching url parameters as they seem to be getting removed from the incoming HttpServletRequest. After some significant searching it sounded like spring security intentionally filtered these out of the incoming requests for security reasons. </p>
  
  <p>It appeared that there was a property stripQueryStringFromUrls which overrode this behavior which could be set via a BeanPostProcessor on the DefaultFilterInvocationSecurityMetadataSource class, however as of 3.1 this property no longer exists (in 3.0.0 it appeared to have moved to FilterChainProxy before disappearing entirely with the next release). </p>
  
  <p>Does spring security still strip out query strings by default or was the disappearance of the configuration property a result of that behavior being removed? If it still does, how do you enabled url parameters as of spring security 3.1? </p>
  
  <p>I am using Spring Security 3.1.3 through the grails spring security plugin (1.2.7). </p>