[BUGFIX] ActionRequest should not serialize parent HTTP request
When working with WebRedirects and authentication, the intercepted
request is serialized with the security context. While it makes sense
to do so, we should not include the reference to the base HTTP request
in this case, as this includes lots of cruft like $_SERVER etc.
In order to test this, just look at the serialized session files
when a web redirect is taking place.
Releases: master, 2.0