I issued a PATCH request from our website deploying on the public web server, and this is the preflight response

Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:authorization,content-type
Access-Control-Allow-Methods:GET,HEAD,PUT,POST,DELETE
Access-Control-Allow-Origin: https//.
Access-Control-Max-Age:2592000
Date:Fri, 17 Nov 2017 09:45:01 GMT
Proxy-Connection:Keep-alive
Server:Tengine

Method PATCH is not allowed by Access-Control-Allow-Methods.

Please update the server configuration

Thank u !