Hi,

Polipo intentionally ignores [1] weak ETags. Why? The very concept of
a weak entity tag [2] exists because some entity tags are unreliable
for concurrency control (aka the "lost update" problem) but still
useful for cache validation.

What's more, Polipo removes weak ETags from responses [3]. Is this
intentional? This doesn't seem right. Even if a weak ETag is (in
theory) unusable for conditional PUT/DELETE, it is generic metadata
that may still be interesting to the client for any reasons (logging,
for instance).

This isn't a problem for me, I'm just curious.

[1] https://github.com/jech/polipo/blob/882029b/http_parse.c#L1039
[2] http://tools.ietf.org/html/rfc7232#section-2.1
[3] https://gist.github.com/vfaronov/7956776b66d3f836dd0f


-- 
Vasiliy

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