Normally the Full Page Caching of Magento Enterprise doesn't work under SSL / HTTPS. This extension overcome this limitation.
Typically e-commerce sites use HTTPS only for checkout, account page, sign-in, registration etc... However, since Google's announcement "HTTPS as a ranking signal" on the 6th Aug 2014, we expect merchants to start adopting HTTPS for the whole site.
This would be a major problem, especially for Magento Enterprise sites. More details can be found on the Elastera's blog "Why Google’s advice on HTTPS will screw your Magento site"
http://www.elastera.com/blog/why-google-advice-on-https-will-screw-your-magento-site/
We've encountered Devs and Ops of a merchant blaming each other at length fo the performance issues, due to the above. We hope this will help merchants avoid a possibly a costly and frustrating issue.
After installation of the module, you will need to modify app/etc/enterprise.xml and change the <request_processor> to
<request_processors>
<ee>Elastera_EnterprisePageCacheSSL_Model_Processor</ee>
</request_processors>
Tested with Magento EE 1.12, 1.13 and 1.14.