Same endpoint for POST and GET method without the duplicate key error? #2698

Hello everyone, I am kinda confused as to why this isn't a thing, or I am I doing this wrong entirely?

I have a user profile path api/user/profile with a GET api/user/profile/{userID} and POST method on the same path. Why isn't that supported, seems like the usual? I mean both should point to the same profile and only differ whether it's a post or a get method. Is this an issue when using a single YAML file or would the issue persist if I split them up into separate files?

(Using swagger)