... with a test case. The fix is in Stapler.

Do not use anymore shaded version of wagon-http as it we can control commons-logging version

This page gets displayed when we throw an unhandled exception.

The exception handler ended up adding almost all the headers again,
resulting in a lot of duplicate headers.

Most critically, stapler was adding "Content-Encoding" header twice,
breaking browsers.

This version supports piping of stdout/stderr directly into
OutputStream, avoiding the need for running a thread to pump the stream.

Integrated the new version of Stapler that fixes them.

This required bridge method injector that maps boolean->void