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SSE handler callback not triggered for GET:/mcp in WebClientStreamableHttpTransport #316

@qnnn

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@qnnn

Hi @chemicL ,
I've observed an issue where the SSE handler callback is not being triggered for GET:/mcp in WebClientStreamableHttpTransport.

The reconnect(null) call in WebClientStreamableHttpTransport consumes the jsonrpcMessage but fails to execute the corresponding SSE handler callback for endpoint GET:/mcp.

if (transportSession
.markInitialized(response.headers().asHttpHeaders().getFirst("mcp-session-id"))) {
// Once we have a session, we try to open an async stream for
// the server to send notifications and requests out-of-band.
reconnect(null).contextWrite(sink.contextView()).subscribe();
}

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