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https://issues.apache.org/jira/browse/COUCHDB-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Holley resolved COUCHDB-3017.
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Resolution: Fixed
Fix Version/s: 2.0.0
Verified fixed in master
> CouchDB 2.0: passing an invalid ETag to _changes incorrectly returns 304 Not
> Modified
> --------------------------------------------------------------------------------------
>
> Key: COUCHDB-3017
> URL: https://issues.apache.org/jira/browse/COUCHDB-3017
> Project: CouchDB
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Will Holley
> Fix For: 2.0.0
>
>
> I discovered this issue whilst running the PouchDB test suite against CouchDB
> 2.0 (in a cluster of 1). It's a bit of an edge case but, essentially, the
> steps to reproduce are:
> 1. create a database /foo
> 2. insert 2 empty documents with _ids "a" and "b"
> 3. call /foo/_changes?limit=1. Note the ETag returned in the response
> 4. delete /foo
> 5. recreate database /foo
> 6. insert 2 empty documents with _ids "a" and "b"
> 7. call /foo/_changes?limit=1, passing an "If-None-Match" header using the
> ETag value captured in (3)
> 8. CouchDB 2.0 returns a 304 Not Modified response - CouchDB 1.6 returns a
> 200 and ignores the If-None-Match value
> The problem for the client is that it would use the cached value from (3)
> which is invalid for this recreated database.
> A full reproduction is at
> https://gist.github.com/willholley/c5f4c30fce822dc7dc48cbc8875c394b with the
> CouchDB 1.6 equivalent at
> https://gist.github.com/willholley/c0b9c6cf2a62090ac3bee4fa549644bd.
> Bob Newson suggested that this was likely down to CouchDB 1.6 using the
> instance_start_time when calculating the ETag for _changes, invaliding
> previously returned ETags if a database is deleted and recreated with the
> same parameters. In 2.0, instance_start_time is always 0 so we need to use a
> different property to ensure unique ETags per database instance (e.g. the
> unique shard suffix).
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