Hello and thanks for your bug report.
I didn't try to setup a reproducer, however this sounds like an upstream
limitation of bug of apache2. If this is actually a bug, the actions we
can take in Ubuntu to fix it very much depend on whether the bug has an
upstream fix or not. A first step in this direction is checking if the
bug is still present in Ubuntu 20.04, the latest LTS release. This is a
coarse step, but should be reasonably easy to take and bounds the
problem.
Are you willing to test your setup using proxypass on Ubuntu 20.04 and
report back with your findings? Waiting for your reply I'm setting the
status of this report to Incomplete, please change it back to New after
commenting back and we'll look at it again. Thanks!
** Changed in: apache2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1895877
Title:
proxypass IPv4-over-IPv6 excludes X-Forwarded-For header
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