Support stale-while-revalidate and stale-if-error #189
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These supports the RFC 5861 extensions to cache control which allow a site to tell a HTTP cache that it's acceptable to serve a stale response while re-validating the currently cached response (
stale-if-revalidate
) and that it's acceptable to serve a stale response if an error occurs (stale-if-error
). These both take a number of seconds for which it is acceptable to serve a stale response for.I didn't write any tests because there doesn't seem to be any that exercise all of the various header options, if this needs tests let me know.