[http] improves client side caching support for GET requests on static files.
[http] improves client side caching support for GET requests on static files.

christianparpart/x0,xzero/x0,christianparpart/x0,christianparpart/x0,xzero/x0,xzero/x0,christianparpart/x0,xzero/x0,christianparpart/x0,christianparpart/x0,xzero/x0,xzero/x0,christianparpart/x0