Move the insert_filter hook from the prepare request phase to the
  invoke handler phase, since it can't fail, and contributes nothing
  to the request 'character', but everything to it's invocation.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92471 13f79535-47bb-0310-9956-ffa450edef68