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* Add SSE stream reconnection support to A2AAgent Implement automatic reconnection for SSE streams that disconnect mid-task, using the Last-Event-ID header to resume from where the stream left off. Changes: - Add InvokeStreamingWithReconnectAsync method to A2AAgent with configurable max retries and delay between attempts - Add new log messages for reconnection events - Add A2AAgent_StreamReconnection sample demonstrating the feature - Update existing polling sample to use simplified SendMessageAsync API - Add unit tests for stream reconnection logic Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * address comments * Address PR review feedback - Dispose SSE enumerator before GetTaskAsync fallback to release HTTP connection - Wrap StreamWriter in using blocks with leaveOpen:true and explicit UTF-8 encoding - Print update.Text instead of update object in stream reconnection sample Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
A2A Agent Stream Reconnection
This sample demonstrates how to reconnect to an A2A agent's streaming response using continuation tokens, allowing recovery from stream interruptions without losing progress.
The sample:
- Connects to an A2A agent server specified in the
A2A_AGENT_HOSTenvironment variable - Sends a request to the agent and begins streaming the response
- Captures a continuation token from the stream for later reconnection
- Simulates a stream interruption by breaking out of the streaming loop
- Reconnects to the same response stream using the captured continuation token
- Displays the response received after reconnection
This pattern is useful when network interruptions or other failures may disrupt an ongoing streaming response, and you need to recover and continue processing.
Note: Continuation tokens are only available when the underlying A2A agent returns a task. If the agent returns a message instead, the continuation token will not be initialized and stream reconnection is not applicable.
Prerequisites
Before you begin, ensure you have the following prerequisites:
- .NET 10.0 SDK or later
- An A2A agent server running and accessible via HTTP
Set the following environment variable:
$env:A2A_AGENT_HOST="http://localhost:5000" # Replace with your A2A agent server host