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Fix transport_security blocking non-localhost bindings

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When binding to a non-localhost host, FastMCP's auto-set restrictive
transport_security causes external connections to be rejected with 421.
Reset it to None so hosts like host.docker.internal are accepted.
This commit is contained in:
Achmad
2026-05-17 05:26:33 +00:00
parent 8eef3bfffc
commit 8cf31a28b5
1 changed files with 5 additions and 0 deletions
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server.py
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@@ -532,6 +532,11 @@ if __name__ == "__main__":
args = parser.parse_args() args = parser.parse_args()
if args.host: if args.host:
mcp.settings.host = args.host mcp.settings.host = args.host
if args.host not in ("127.0.0.1", "localhost", "::1"):
# FastMCP auto-sets restrictive transport_security for localhost at init time.
# Reset it when binding to a non-localhost address so external hosts
# (e.g. host.docker.internal) are not rejected with 421.
mcp.settings.transport_security = None
if args.port: if args.port:
mcp.settings.port = args.port mcp.settings.port = args.port
mcp.run(transport=args.transport) mcp.run(transport=args.transport)