class OnStreamFailed

The stream has failed, but the StreamProcessor instance is still usable

for a new stream.

This message is only ever sent by the server if the client previously

sent EnableOnStreamFailed(). If the client didn't send

EnableOnStreamFailed() then the server closes the StreamProcessor

channel instead.

StreamProcessor server implementations are encouraged to handle stream

errors (and ideally to also report them via error_ bools of

OnOutputPacket() and OnOutputEndOfStream()) without failing the whole

stream, but if a stream processor server is unable to do that, but still

can cleanly contain the failure to the stream, the stream processor

server can (assuming EnableOnStreamFailed() was called) use

OnStreamFailed() to indicate the stream failure to the client without

closing the StreamProcessor channel.

An ideal StreamProcessor server handles problems with input data without

sending this message, but sending this message is preferred vs. closing

the server end of the StreamProcessor channel if the StreamProcessor

server can 100% reliably contain the stream failure to the stream,

without any adverse impact to any later stream.

No further messages will arrive from the server regarding the failed

stream. This includes any OnOutputEndOfStream() that the client would

have otherwise expected.