This was an offramp for generated etags to allow existing caches
to be served until people could upgrade. It has been about 6 months
since the transitional version was released, so we can remove this
transitional code now.
4ec8cfe611
This changes the CompactIndexClient to store etags received from the
compact index in separate files rather than relying on the MD5 checksum
of the file as the etag.
Smoothes the upgrade from md5 etags to opaque by generating them when no
etag file exists. This should reduce the initial impact of changing the
caching behavior by reducing cache misses when the MD5 etag is the same.
Eventually, the MD5 behavior should be retired and the etag should be
considered completely opaque with no assumption that MD5 would match.
