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This code adds the responseHeaders to the error passed to defferred.reject when a call fails. This provides additional insight into the failure by exposing the response headers and allows handling cases like 429 codes where additional info (the retry time) is contained in the response headers.
big assist from @shpros
small additional cleanup
Update readme.md to be more non-node expert friendly
Fix typo in test.js
Add/Merge responseHeaders to error before calling defer.reject in all wrapped calls.
This allows upstream caller to inspect Headers in order to potentially determine source of the error.
Add test case.