Fischer's Defense

Hey, I'm preparing an opening repertoire in the King's Gambit. As many know, the most testing variation to King's Gambit is the Fischer's defense. I'm using Houdini to do some opening analysis and it's top recommended move after d6 is 4. Qe2. There aren't any games with 4. Qe2 in chess.com's database either. I was wondering if any experience players or King's Gambit enthusiasts could offer advice on how to play 4. Qe2. Specifically, what goals white should try to achieve with Qe2, weaknesses in both player's positiosn, potential traps, etc. Thanks in advance!

I wouldn't worry about Qe2.  It seems like the type of move that an engine mistakenly suggests when it is consulted too early in the opening phase.  Only sloughterchess can really say what the purpose of Qe2 is!

Hushpuckena is right and there is also the counter gambit d5

My rating on here might not indicate my true playing strength. I know the ideas behind most openings, and I was surprised as to what Houdini suggested and was wondering if there were some deeper idea to Qe2. d6 is the most testing try against the King's gambit because many of his ideas are hindered. For one, the knight doesn't have to positional e5 square to go to if black decides to push his kingside pawns. 

I'm also looking at this from white's perspective, not black's. so Falkbeer isn't what i'm looking for.

EDIT: also for 2200 is my goal, Fischer's gambit is a KGA variation. Not a KGD one. Sorry for confusion

I've experimented with the 4.Qe2 line once.

to tell the truth, I have never been fond of the Knights Gambit, I much prefer the Bishops gambit