=htp #16064 fail properly and early if Gzip header is corrupt
=htc #16067 fix Chunked.transformDataBytes' onError/cleanup behavior
=htp #15921 import CodingDirectives from spray
=htp #16063 fail on data truncation for GZIP coding
Merge pull request #16068 from spray/w/15921-import-encoding-directives

15921, 16064, 16067 Import CodingDirectives + related fixes