_requestWorker code review and refactor #48
Description
Looks like definite opportunities to streamline the code in _requestWorker, while also making it more robust and testing more cases:
- separate clauses for GET/POST/DELETE are largely redundant
- deferredHook handling - currently only in POST
- re-signing if the old signature would expire in the next n seconds - currently only in POST
- investigate exiting the iteration if the request will never return 200 - currently only 200 will clear keepTrying