405 method not allowed Web API

Question

This error is very common, and I tried all of the solutions and non of them worked. I have disabled WebDAV publishing in control panel and added this to my web config file:<

Answer 1

My problem turned out to be Attribute Routing in WebAPI. I created a custom route, and it treated it like a GET instead of WebAPI discovering it was a POST

    [Route("")]
    [HttpPost] //I added this attribute explicitly, and it worked
    public void Post(ProductModel data)
    {
        ...
    }

I knew it had to be something silly (that consumes your entire day)