fix: handle SSE transport send errors after SSE disconnects#1733
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…ontextprotocol#1014) When the SSE connection is closed (e.g. client disconnects during rapid reconnection), webAppTransport.send() rejects with "Not connected". The stderr handler was calling send() without awaiting or catching the returned promise, causing unhandled rejections that crash the server. Add .catch() to both send() call sites in the stderr data handler so that errors from a closed SSE connection are silently ignored instead of crashing the process. Also move the cleanup logic in the MODULE_NOT_FOUND branch into .finally() so transports are cleaned up regardless of whether the notification send succeeded.
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Summary
webAppTransport.send()promises in the stdio stderr handler.finally()for theMODULE_NOT_FOUNDpath so cleanup still runs if the SSE client already disconnectedNot connectedrejections when multiple SSE connections race and one closes before stderr forwarding completesTesting
npm cinpm run build-serverFixes #1014.
Supersedes the earlier stale attempt in #1129.