Write "event: message" to SSE response #192
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stephentoub
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Apr 2, 2025
stephentoub
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Apr 2, 2025
src/ModelContextProtocol/Protocol/Transport/SseResponseStreamTransport.cs
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stephentoub
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Apr 2, 2025
eiriktsarpalis
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Apr 2, 2025
# Conflicts: # src/ModelContextProtocol/Shared/McpSession.cs
This was referenced Jul 24, 2025
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Even though this wastes a few more bytes per message in the SSE response stream, this appears to be the way to send SSE message events that's most compatible with existing MCP clients.
I also took the opportunity to rename McpJsonRpcEndpoint to just McpEndpoint. I wanted to do that in my earlier refactoring PR that split a lot of it out into McpSession, but I was trying to keep that change as small as I could. I don't think it's worth a whole PR just to rename it now though.
Lastly, I removed the unused McpServerConfig.Arguments property. Arguments are now passed in via McpServerConfig.TransportOptions["arguments"] instead.