Grails redirect and spring security

Question

Calling a redirect inside a controller action always add a strange fragment to the redirect url.

Grails 2.1.0

def index = {
   ...
   //Spring security programmatic authentication
   ...
  redirect(uri: '/me')
}

Whill redirect the browser to /me#_=_

Tried to alter the redirect adding

redirect(uri: '/me', fragment:null)

or

redirect(uri: '/me', absolute:true)

don't change the result

where that #_=_ came from????