Custom method in the HTTP Request Node.
I would use it to communicate to a Nextcloud Caldav using “REPORT” but I think there are many other use cases.
This feature would open up the possibility for all kinds of API’s that use non standard methods.
WebDav Methods: WebDAV - Wikipedia
Feature request for “OPTIONS” method: HTTP Request Node - OPTIONS request method
Feature request for “CONNECT” method: Add support for CONNECT method on HTTP Request Node
Not really, because I have never looked into the source of n8n but as it is probably a small change I might be able to with some help provided.