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MSC3871: Gappy timelines #3871

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@MadLittleMods MadLittleMods commented Aug 18, 2022

A proposal for letting homeservers give feedback to clients where there is a gap in the timeline from a /messages response.

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Spawned from a discussion with @erikjohnston about making /messages faster

@MadLittleMods MadLittleMods changed the title MSCXXX: Gappy timelines MSC3871: Gappy timelines Aug 18, 2022
@MadLittleMods MadLittleMods marked this pull request as ready for review August 18, 2022 02:39
@turt2live turt2live added proposal A matrix spec change proposal client-server Client-Server API kind:feature MSC for not-core and not-maintenance stuff needs-implementation This MSC does not have a qualifying implementation for the SCT to review. The MSC cannot enter FCP. labels Aug 18, 2022
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As suggested by @benkuly,
#3871 (comment)

The synthetic event approach is still listed as an alternative
messages anyway but they do probably see our slow `/messages` pagination.


### Expose `prev_events` to the client

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That would simplify things dramatically, seems.
Same approach of gap-filling that is used for server-server could be employed for client-server.

Additionally, would make it possible for clients to issue full events, as wondered in MSC4080, since it becomes possible for clients to detect forward extremeties.

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