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DeltaHandler: Unclear handling with ETags #225

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oli-h opened this issue Jun 13, 2018 · 0 comments

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oli-h commented Jun 13, 2018

Gateleen's DeltaHandler seems to have to main operation modes:

Work with a sequence number, automatically increased with each PUT, to find resources which are 'newer' than those a client already has
Work with ETag

Mode 1 is quite clear and well documented.
But behavior of Mode 2 - especially when combined with ExpansionHandler - is unclear:

It is not documented
It's not clear how and what a client should request (set which headers and/or parameters) to make use of the "Delta"-mechanism
Its magical how this mechanism can find resources 'which a client doesn't already has' - as we request only with max. one ETag (if-none-match or so....)

Need at least clarification and examples - or perhaps we find that the ETag based Delta-mechanism is broken

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