refactor(remote-filesystem): return headers from copy/get_contents

Wrap RemoteFilesystem in Rc<RefCell<>> inside HttpDownloader, in prep
for the upcoming &self conversion of add()/get(). copy()/get_contents()
now bundle the response headers into their return value instead of
requiring a follow-up get_last_headers() call, since two separate calls
through a shared RefCell could otherwise race: nothing would guarantee
the reader observes the headers from its own request rather than one
clobbered by a concurrently borrowed call. get_last_headers() itself is
left in place, mirroring RemoteFilesystem::getLastHeaders() in PHP.

0 files changed, 0 insertions, 0 deletions