Describe the bug
Unable to use async callbacks for tools/resources with Streamable HTTP transport.

To Reproduce
Steps to reproduce the behavior:
Define tool/resource that takes async function as callback.

For example

server.resource('some resource', 'config://some/resource', async () => { ... })

In result I get Error MCP error -32001: Request timed out

Expected behavior
Allows to use async logic inside callbacks.

Logs

Additional context