Silence encoding errors, as it's a nuisance for encoding sniffing.

TODO: This didn't make it into the previous release.

Define special psuedo-MIMEtypes for error responses.

Expose redirected URIs to caller.

Improve error reporting & it's localization

Add documentation, minor exported API adjustments.

Extract URL resolver from Rhapsode

Each URI scheme can be turned on and off at build-time,
which has the side-effect of clearly labelling the code.