To find out which request methods a server supports, one can use curl and issue an OPTIONS request:
curl -X OPTIONS
http://example.org -i
The response then contains an Allow header with the allowed methods:
HTTP/1.1 204 No Content
Allow: OPTIONS, GET, HEAD, POST
Cache-Control: max-age=604800
Date: Thu, 13 Oct 2016 11:45:00 GMT
Expires: Thu, 20 Oct 2016 11:45:00 GMT
Server: EOS (lax004/2813)
x-ec-custom-error: 1