stokito commented on pull request #337:
URL: https://github.com/apache/tomcat/pull/337#issuecomment-672871214
I reviewed and it looks fine and simpler. I just want to note here for
history that according RFC 7232 sec 2.3.2 if resource's real etag is weak than
strong comparison always failed:
ETag 1 | ETag 2 | Strong Comparison | Weak Comparison
-- | -- | -- | --
W/"1" | W/"1" | no match | match
W/"1" | W/"2" | no match | no match
W/"1" | "1" | no match | match
"1" | "1" | match | match
That's why in my version I added the note:
// BZ 64265: By default Tomcat generates weak etag for resource.
// But If-Match uses strong matching that expects a strong
resource etag.
// So we strip any leading "W/" and then compare using equals
String resourceEtag = weakEtagToStrong(eTag);
I.e. that code is a workaround for fact that Tomcat generates weak ETag for
static resource while should generate strong (that was discussed in #324). Now
when client will send the received weak etag it will always get 412. And this
is correct according spec but may be unexpected for a client. But I'm pretty
sure that nobody uses the `If-Match` anyway: a browser never sends it.
I think that we should keep this version and instead in some feature
releases switch Tomcat to generate strong etags by default.
But this is another story.
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