END_SEGMENT?

What is the purpose of END_SEGMENT?



Section 6.1 of the editor's copy says: "[END_SEGMENT] indicates that this frame is the last for the current segment. Intermediaries MUST NOT coalesce frames across a segment boundary and MUST preserve segment boundaries when forwarding frames."



Segment of what?



Are there recommended uses or can it be used for whatever an application wants?



Should intermediaries immediately flush the frames when END_SEGMENT is set?





I accidentally discovered the draft "Protocol Layering in HTTP/2" which suggests a potential use case.  In Section 3.1 it says: "... the DATA frames of HTTP/2 SHOULD include a flag to mark the message boundary, for example END_SEGMENT"

http://www.ietf.org/id/draft-zhu-httpbis-http2-protocol-layering-00.txt







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