StartAsync -> FlushAsync

MackinnonBuck · MackinnonBuck · commit 2bca8f4ce680 · 2026-01-27T10:49:48.000-08:00
diff --git a/src/ModelContextProtocol.AspNetCore/StreamableHttpHandler.cs b/src/ModelContextProtocol.AspNetCore/StreamableHttpHandler.cs
@@ -158,7 +158,7 @@ await WriteJsonRpcErrorAsync(context,
             // We should flush headers to indicate a 200 success quickly, because the initialization response
             // will be sent in response to a different POST request. It might be a while before we send a message
             // over this response body.
-            await context.Response.StartAsync(cancellationToken);
+            await context.Response.Body.FlushAsync(cancellationToken);
             await session.Transport.HandleGetRequestAsync(context.Response.Body, cancellationToken);
         }
         catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)

Original file line number	Diff line number	Diff line change
`@@ -158,7 +158,7 @@ await WriteJsonRpcErrorAsync(context,`
`158`	`158`	`// We should flush headers to indicate a 200 success quickly, because the initialization response`
`159`	`159`	`// will be sent in response to a different POST request. It might be a while before we send a message`
`160`	`160`	`// over this response body.`
`161`		`- await context.Response.StartAsync(cancellationToken);`
	`161`	`+ await context.Response.Body.FlushAsync(cancellationToken);`
`162`	`162`	`await session.Transport.HandleGetRequestAsync(context.Response.Body, cancellationToken);`
`163`	`163`	`}`
`164`	`164`	`catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)`