Insert http header to OCSP request

Hello, I am trying to figure out if it's possible to insert http host header when the F5 makes OCSP request to OCSP responder/server via APM policy? The problem that I have is that F5 sends simple OCSP / POST request without host-header (captured via wireshark) and the OCSP server returns HTTP 302 redirect instead of result of client-cert check. I issued openssl ocsp command with -header Host to the same OCSP server and the cert was checked and proper response was returned.( also captured with wireshark and the only difference in both requests is the host-header). I tried to insert iRule event-box before the OCSP Auth-box and insert the header, but that didn't work.