If you ever tried to record HTTPS requests by the recording proxy of the lastest stable version of JMeter (2.3.4) you know that it's impossible. And HTTPS spoofing option can not help in the most cases.
I investigated this problem and found interesting thing. There is already a bug 47622 in JMeter's Bugzilla that already has RESOLVED FIXED status. Some guys added a patch and fake SSL certificate to JMeter so it allows to record HTTPS requests now. But you must use developer (nightly) build instead of stable release until this bugfix is added to next stable release.