fix: explain transport host rejections#2726
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Summary
host_not_allowed, the received Host value, and theTransportSecuritySettings.allowed_hostssettingallowed_hostsconfiguration with host and host:port examplesFixes #2688.
To verify
uv run pytest tests/server/test_transport_security.py tests/server/test_streamable_http_security.py tests/server/test_sse_security.py tests/interaction/transports/test_hosting_http.py -quv run ruff check src/mcp/server/transport_security.py tests/server/test_transport_security.py tests/server/test_streamable_http_security.py tests/server/test_sse_security.py tests/interaction/transports/test_hosting_http.pyuv run pyright src/mcp/server/transport_security.py tests/server/test_transport_security.py tests/server/test_streamable_http_security.py tests/server/test_sse_security.py tests/interaction/transports/test_hosting_http.pygit diff --check