Recommend a different Onion-Location config for Apache 2
Recommend the following type of construction at the [Onion-Location][] docs:
Header set Onion-Location "http://testkvehgz4pi23mj6wqhb2hkglx2omcelqjams4f3ph2gklqkxhikid.onion%{REQUEST_URI}s"
Instead of:
Header set Onion-Location expr="http://testkvehgz4pi23mj6wqhb2hkglx2omcelqjams4f3ph2gklqkxhikid.onion%{REQUEST_URI}"
References: