It seems there is no option to avoid this error : "Verify return code: 20 (unable to get local issuer certificate)". Is there a way to avoid issuer ssl check with AB (like wget's -no-check-certificate option)
Thanks in advance
Short answer: NO.
Related SO thread https://stackoverflow.com/questions/189993/how-do-i-fix-ssl-handshake-failed-with-apachebench contains some workarounds.