Opened 11 years ago
Closed 11 years ago
#330 closed design (fixed)
is ETag a representation header field?
Reported by: | julian.reschke@… | Owned by: | draft-ietf-httpbis-p3-payload@… |
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Priority: | normal | Milestone: | 19 |
Component: | p3-payload | Severity: | Active WG Document |
Keywords: | Cc: |
Description
Reported by zhong.j.yu@…:
"http://tools.ietf.org/html/draft-ietf-httpbis-p3-payload-17#section-4.1 Section 4.1. Representation Header Fields
"Last-Modified" is included, but not "ETag".
Isn't "ETag" also part of representation metadata?
Cheers, Zhong Yu"
Change History (6)
comment:1 Changed 11 years ago by masinter@…
comment:2 Changed 11 years ago by masinter@…
unlike lastModified, which could be construed as information about the resource, independent of this particular representation.
As such it might be that content-negotiated resources could be matched against any one of the eTags of cached content. Resource --> Representations w/etags --> (selection by varying request headers) --> Representation with eTag
eTags are only URI/resource-unique, or the caching could be extended. Is it feasible in future to add an indication to eTag that it is in fact a GUID?
comment:3 Changed 11 years ago by fielding@…
- Milestone changed from unassigned to 19
- Resolution set to incorporated
- Status changed from new to closed
ETag and Last-Modified are metadata for the selected representation, which is not always the same as the representation enclosed in the response. I have added those terms from p4 and used a separate table to reference the fields.
Incorporated in [1571].
comment:4 Changed 11 years ago by julian.reschke@…
comment:5 Changed 11 years ago by mnot@…
- Resolution incorporated deleted
- Status changed from closed to reopened
comment:6 Changed 11 years ago by mnot@…
- Resolution set to fixed
- Status changed from reopened to closed
I think so, the eTag for a representation tells the validity of that representation as corresponding to the current state of the resource.