[master] $ git bisect start
[master] $ git bisect good fd65a9000b550509358dfdcd557c0bb882630d4e
[master] $ git bisect bad 4e961ca184d39bcc3755d017e94bf03c6e656b29
Bisecting: a merge base must be tested [ee614af6fa6c9e8cac70bcfd7d3583d0b4ff907b] Merge pull request #17812 from jonatack/patch-8 [(no branch, bisect started on master)] $ git bisect good
Bisecting: 5322 revisions left to test after this (roughly 12 steps) [e16afe61abd78c55f80752ca020b90d59ae1940f] stop applying default headers in ActionDispatch::Response [(no branch, bisect started on master)] $