Motivation:
We didn't correctly handle the case when no content-type header was found or if the charset was illegal and just did throw a NPE or ICE. We should in both cases throw an ErrorDataDecoderException to reflect what is documented in the javadocs.
Modifications:
- Throw correct exception
- Merge private method into the constructor as it is only used there
- Add unit tests
Result:
Throw expected exceptions on decoding errors
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