The OCSP Responder of CAcert is available at http://ocsp.cacert.org/ and http://ocsp.cacert.org:2560/
The OCSP Responder runs at the port 2560, the following Apache rule makes it available on Port 80:
RewriteCond %{CONTENT_TYPE} !^application/oscp-request$ RewriteRule ^/(.*) http://localhost:2560/ [P]
The hostname ocsp.cacert.org is distributed with round-robin DNS. If you would like to host another OCSP responder for CAcert, pleaseg contact us.