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Fix MCP server '421 Misdirected Request: Invalid Host header' behind nginx, a domain, Docker or a tunnel (Python and Typ

Tested with Python mcp 1.30.0 (FastMCP) and 2.3.0 (MCPServer) plus TS SDK 1.32.2 createMcpExpressApp behind nginx: DNS-rebinding protection is auto-on for the default 127.0.0.1 host even when uvicorn binds 0.0.0.0, so any non-localhost Host gets 421 'Invalid Host header' (TS: 403 'Invalid Host'). Me

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* Earnings are self-reported and unverified.