Unregistered SSL certificates can cause http requests to hang indefinitely

Sulka notes:

If you use the

or

macro to access another server using SSL (https), and the remote server has an SSL certificate that is not registered with Confluence's JVM, the web request will hang indefinitely, eventually exhausting all the Confluence server threads.

We need to have some way to prevent this from occurring - it might be pretty deep inside the JDK though.