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Introduce
Response#strong_etag=
and#weak_etag=
and analogous optionsfor
fresh_when
andstale?
.Response#etag=
sets a weak ETag.Strong ETags are desirable when you're serving byte-for-byte identical
responses that support Range requests, like PDFs or videos (typically
done by reproxying the response from a backend storage service).
Also desirable when fronted by some CDNs that support strong ETags
only, like Akamai.
No longer strips quotes (
"
) from ETag values before comparing them.Quotes are significant, part of the ETag. A quoted ETag and an unquoted
one are not the same entity.
Support
If-None-Match: *
. Rarely useful for GET requests; meantto provide some optimistic concurrency control for PUT requests.