How to know if a HTTP2 DATA frame contains an entire protobuf message or there will be more segments

[yihao yang]

Hi, all:

The title is my question. In this spec, https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md.

The "requests" is a single stream. But how can I know a single request is over? Since a tcp frame is maximum 65535 bytes.

But a grpc protobuffer request can be much larger. If I have serveral requests to be sent on the stream. How can I distinguish the boundary of each request?

Thanks,

Yihao

[Michael Lumish]

The requests stream is a stream of Length-Prefixed-Message, and that length prefix tells you how much data to expect for each message.

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