note right of User: Proxy cacheable Server mapped byte ranges
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 \n Accept-Range-Redirect: bytes
activate Proxy
Proxy->OriginServer: GET /video.ogv HTTP/1.1 \nRange: t:npt=10-20 Accept-Range-Redirect: bytes
activate OriginServer
note right of OriginServer: 
Server converts the given time range to a byte range,
sends an empty reply that refers to the right byte range for the correct time range
end note
OriginServer->Proxy: HTTP/1.1 307 Temporary Redirect \nLocation: http://www.example.com/video.ogv \nAccept-Ranges: bytes, t, xywh, track, id \nContent-Length: 0 \nContent-Range: t:npt 11.85-21.16/653.791 \nRange-Redirect: 19147-22890 \nVary: Accept-Range-Redirect
deactivate OriginServer
Proxy->UserAgent: HTTP/1.1 307 Temporary Redirect \nLocation: http://www.example.com/video.ogv \nAccept-Ranges: bytes, t, xywh, track, id \nContent-Length: 0 \nContent-Range: t:npt 11.85-21.16/653.791 \nRange-Redirect: 19147-22890 \nVary: Accept-Range-Redirect
deactivate Proxy
note right of UserAgent:
Proceed to put actual fragment request through as a normal byte range request 
end note
UserAgent->Proxy: GET /video.ogv HTTP/1.1 \nHost: www.example.com \nRange: 19147-22890
activate Proxy
Proxy->OriginServer: GET /video.ogv HTTP/1.1 \nHost: www.example.com \nRange: 19147-22890
activate OriginServer
note right of OriginServer: Extracts bytes corresponding to range
OriginServer->Proxy: HTTP/1.1 206 Partial Content \nAccept-Ranges: bytes, t, xywh, track, id \nContent-Range: bytes 19147-22880/35614993 \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 19147-22880/35614993 \nContent-Range: t:npt 11.85-21.16/653.791
deactivate Proxy
UserAgent->User: Serve the decoded content to the User \nfrom the appropriate time-offset
deactivate UserAgent
note right of UserAgent:
The caching Web proxy has now cached the byte range, 
since it adhered to the normal byte range request protocol 
end note