I sometimes hear the bridge played as a series of three ii-V-I progressions before the turnaround to the home key.
But I have also heard it played with the first chord of the bridge as a major 7th chord on the IV, related to the first ii-V-I key if that makes sense.
So, playing it on the piano in Eb, that could mean the first chord of the bridge is an Abm7 or a B maj. 7. I kind of like the sound of the latter because it seems a little less expected, but either work.
Last night, I listened to a very early recording by Benny Carter, and I heard the series of three ii-V-I progressions, but the fidelity wasn't the best.