How to support curl -X OPTIONS on server?

[ruanqizhen]

Looks like the service for the demo has been modified, it supports
curl -X OPTIONS https://valhalla1.openstreetmap.de/height -D -
but if I curl my own service build on Valhalla souce, it returns the following error:
{"error_code":101,"error":"Try a POST or GET request instead","status_code":405,"status":"Method Not Allowed"}