This wouldn't actually result in false positives. If a test failed, the
expectation error message above this line would print, and then we would
fail the test. The point of this flag is just to avoid printing "PASS!"
as well, to avoid confusion.
Our HTTP disk cache is currently manually tested against various sites.
This patch adds some tests to cover various scenarios, including non-
cacheable responses, expired responses, and revalidation.
In order to ensure we hit the disk cache in RequestServer, we must
disable the in-memory cache in WebContent.
