first draft

proposals/xxxx-http-range.md

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+# MSCXXXX: HTTP Range on content repository
+
+## Proposal
+
+This MSC aims to make HTTP Range capability *mandatory* on the content repository fetch endpoint.
+
+[HTTP Range](https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests) is a Header-based
+method by which browsers and other clients can request a certain byte-range of a file.
+
+Most modern browsers depend on this mechanism to scrub through video footage, and the absence would
+make some media playback unable to be scrubbed through.
+
+This would only affect CS endpoint `/_matrix/media/v3/download/{serverName}/{mediaId}`.
+
+## Unstable prefix
+
+This MSC would only add a well-known HTTP capability to an existing endpoint, which can easily be
+ignored by existing clients, I think it's overkill to require an unstable prefix for this.