fix: add resilient SSE streaming and HTTP keep-alive for Copilot Studio - #675
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tracyboehrer (tracyboehrer) merged 1 commit intoAug 3, 2026
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Wrap the Copilot Studio SSE stream enumeration (SendActivityAsync / StartConversationAsync) in retry-with-backoff to handle transient TCP resets from idle-sensitive intermediaries on long generative turns. Changes: - GenesysHandoffAgent.Streaming.cs: partial class with resilient HandleNewConversation and HandleCopilotStudioMessage (3 attempts, exponential backoff, idempotency guard, friendly fallback message). - Services/McsHttpClientRegistration.cs: configures the named 'mcs' HttpClient with SocketsHttpHandler keep-alive pings and infinite handler lifetime to prevent mid-stream handler recycling. - Program.cs: use AddResilientMcsHttpClient() instead of bare AddHttpClient(). - README.md: add Production Hardening section documenting Blob Storage RBAC, MSAL distributed cache, and persistent IStorage requirements. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
tracyboehrer (tracyboehrer)
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Aug 3, 2026
tracyboehrer (tracyboehrer)
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August 3, 2026 13:16
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Summary
Fixes the recurring
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.error on long Copilot Studio generative turns in the genesys-handoff sample.Root Cause
The SSE stream enumeration (
SendActivityAsync/StartConversationAsync) has no exception handling and no retry. On long generative turns (~10s+ silence on the wire), an idle-sensitive intermediary RSTs the outbound socket (SocketException 10054). The unguardedIOExceptionpropagates to theCloudAdapterdefault error handler, which leaks the raw transport error to the end user.Changes
GenesysHandoffAgent.Streaming.cs(new)HandleNewConversationandHandleCopilotStudioMessage— retry-with-backoff (3 attempts, 500ms exponential), idempotency guard (no retry after assistant reply surfaced), friendly fallback on exhaustionServices/McsHttpClientRegistration.cs(new)AddResilientMcsHttpClient()extension configuring themcsHttpClient withSocketsHttpHandlerkeep-alive pings (15s,WithActiveRequests) andSetHandlerLifetime(Infinite)GenesysHandoffAgent.cspartial; removed unguarded streaming methods (moved to partial file)Program.csAddHttpClient()withAddResilientMcsHttpClient()README.mdTesting