fix: allow transport restart after close()#1647
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matantsach wants to merge 1 commit intomodelcontextprotocol:mainfrom
Open
fix: allow transport restart after close()#1647matantsach wants to merge 1 commit intomodelcontextprotocol:mainfrom
matantsach wants to merge 1 commit intomodelcontextprotocol:mainfrom
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close() aborts _abortController but never resets it to undefined, so start() sees a truthy guard and throws "already started." Same issue in SSEClientTransport with _eventSource. Also reset _endpoint in SSE to avoid stale endpoint URLs after restart. Fixes modelcontextprotocol#1641 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@modelcontextprotocol/client
@modelcontextprotocol/server
@modelcontextprotocol/express
@modelcontextprotocol/hono
@modelcontextprotocol/node
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Summary
Fixes #1641.
StreamableHTTPClientTransportandSSEClientTransportcannot be restarted afterclose()because internal guard variables are not reset toundefined.Changes
StreamableHTTPClientTransport.close(): Reset_abortControllertoundefinedafter aborting, sostart()can create a fresh controllerSSEClientTransport.close(): Reset_abortController,_eventSource, and_endpointtoundefined— clears both start guards and avoids stale endpoint URLs on restartTesting
StreamableHTTPClientTransport: start → close → start → send → verify functionalSSEClientTransport: start → close → start → send → verify functionalpnpm test:all,pnpm check:all)