mcp: support SSE polling and server disconnects (SEP-1699) #663
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This CL implements support for SEP-1699, adding the following new API: - Event.Retry corresponds to the 'retry' field of a server sent event. This is used to signal client retry behavior. - RequestExtra.CloseStream is set by the streamable transport to allow closing a stream. The streamable server transport is updated to set CloseStream for calls, allowing server operations or middleware to close the underlying stream. If the configured 'reconnectAfter' delay is set, a 'retry' message is sent prior to terminating the stream. The streamable client transport is updated to read the configured delay. Fixes modelcontextprotocol#630
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markus-kusano
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Dec 1, 2025
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This CL implements support for SEP-1699, adding the following new API:
The streamable server transport is updated to set CloseStream for calls, allowing server operations or middleware to close the underlying stream. If the configured 'reconnectAfter' delay is set, a 'retry' message is sent prior to terminating the stream.
The streamable client transport is updated to read the configured delay.
Fixes #630