Motivation:
Even if its against the HTTP RFC there are situations where it may be useful to use other chars then US_ASCII in the headers. We should allow to make it possible by allow the user to override the how headers are encoded.
Modifications:
- Add encodeHeaders(...) method and so allow to override it.
Result:
It's now possible to encode headers with other charset then US_ASCII by just extend the encoder and override the encodeHeaders(...) method.
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