caching vs revalidation in http1.1
Daniel Hellerstein (danielh@mailbox.econ.ag.gov)
Mon, 04 May 1998 15:44:54 -0400
There may be cases where an origin server has semi-permanent
resources (that change every few hours or days). If these change
irregularly, allowing proxies to cache this may be problemmatic (i.e.;
one can not know a proper maxage value)
A second best solution would be to allow proxies to cache, but
insist they perform a conditional get (an If-modified of If-no-match)
before using the cached item.