note right of User: URI fragment requested for 1st time
User->UserAgent: http://www.example.com/video.ogv#t=10,20
activate UserAgent
note right of UserAgent: 
No local copy of fragment in buffer,
Cannot map fragment to byte ranges
end note
UserAgent->Proxy: GET /video.ogv HTTP/1.1 \nRange: t:npt=10-20
activate Proxy
Proxy->OriginServer: GET /video.ogv HTTP/1.1 \nRange: t:npt=10-20
activate OriginServer
note right of OriginServer: 
Map fragments to byte ranges,
Extracts bytes corresponding to range
end note
OriginServer->Proxy: HTTP/1.1 206 Partial Content \nAccept-Ranges: bytes, t, xywh, track, id \nContent-Range: bytes 19147-22890/35614993 \nContent-Range: t:npt 11.85-21.16/653.791
deactivate OriginServer
Proxy->UserAgent: HTTP/1.1 206 Partial Content \nAccept-Ranges: bytes, t, xywh, track, id \nContent-Range: bytes 19147-22890/35614993 \nContent-Range: t:npt 11.85-21.16/653.791
deactivate Proxy
note right of UserAgent
Byte ranges received that require to serve t=10,20
which may well be slightly more (from a seekable entry point, t=11.85-21.16)
end note
UserAgent->User: Serve the decoded content to the User \nfrom the appropriate time-offset