Caching OPTIONS Response

[anish10dec]

We are using Nginx to deliver Widevine Streaming over Web.

Website sends OPTIONS request as a preflight check with every fragment
request for streaming.

Since Nginx by default caches GET, HEAD, we tried including OPTIONS method
to cache on Nginx.

proxy_cache_methods GET HEAD OPTIONS;

Gives error messsage as Invalid value.

Below links says OPTIONS cannot be cached 
https://forum.nginx.org/read.php?2,253403,253408

This is causing all the request of preflight check from Browser to load
Origin Server having Nginx.
Please suggest a way to handle OPTIONS request 

Regards,
Anish

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,283592,283592#msg-283592