Allow JIRA to use two-way SSL with mandatory client certificate

Problem Definition

Currently JIRA is not able to send a client certificate in two-way SSL configuration.
The reason for this feature is in JIRA 7, to improve gadget load performance JIRA needs to be able to connect back to its own URL.
If the URL points to a reverse proxy that has two-way SSL enforced, e.g. possibly via Apache HTTP Server's SSLVerifyClient, then JIRA would need to be able to present a client certificate to the proxy. This fails and a "handshake_failure" is thrown.

Suggested Solution

Allow JIRA to send a client certificate when requested.

Workaround

Configure Apache HTTP to not ask for client certs from JIRA host, e.g. similar to question below:
http://serverfault.com/questions/411858/allowing-users-in-from-an-ip-address-without-certificate-client-authentication