Avoid sorting query string if not necessary (on redirects)

[leshatai]

I am implementing a REST-WS with symfony using HMAC for security.
So, when calculating the check sum I build a string containing any data send to the server.
On the server side I have to recalculate the check sum, but as GET-Parameters are getting
sorted when calling $request->getQueryString() this leads to an other check sum, so the authentication
fails, even everything else is fine.

I also tried to use $request->server->get('QUERY_STRING') but this does not work as it seems that the request
is redirected ( https://github.com/fabpot/Silex/issues/149 ) even with GET - parameters.
So /an/uri?b=2&a=1 becomes /an/uri/?a=1&b=2, which would be ok, but the params are sorted as well, which
causes a false check sum.

It would be nice $request->server->get('QUERY_STRING') always returns the original parameter order.

[fabpot]

$request->server->get('QUERY_STRING') does return the original query string.