[Answer]-Bucket POST must contain a field named 'key'

1👍

Python dicts are unordered. When serializing them, there is no way to predict the order of the key/values pairs.

Try again with an OrderedDict.

Edit:
As of Python 3.6, dicts are ordered by default, this is an implementation detail, not a new standard. Keep using OrderedDict, it is more explicit, more compatible and future proof.

👤aumo

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