Advanced RequestTransport implementations. Any available to use?

We have been using the DefaultRequestTransport implementation but now we want features like:

* Retry after seeming network or server error (exponential back off )

* Different queues with throttling, priority etc

* Detect auth failure, prompt for re-auth, retry

* Expose state of the request transport, requests pending etc to drive progress indicators...

This all seems like quite standard stuff? GMail does most or not all of this.

Anyone know of some existing code we could use?

Cheers

Sam

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