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0e1f616
(Get the code!)
To follow up on Josh's comment, we have noticed the failure only occurs with Python 3 (tested with 3.5.2 and 3.6.0) but not Python 2.7.10.
Looking further into the issue, we found that the client is not sending both of the Content-Type headers. Instead the (non-deterministic) iteration through the headers by the underlying `requests` library, which converts the header name to a string, leads to the last Content-Type value in the iteration being used:
https:/