Comment 1 for bug 1895877

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!