How to receive a form parameters using receive<T>?

Base on the document, ktor supports receiving a form parameters (urlencoded or multipart) using receive<T>. Form Parameters (urlencoded or multipart)

However, the following source return HTTP status 415

<form method="post" action="/create">
        <input type="text" name="foo">
        <input type="text" name="bar">
        <input type="submit">
</form>

data class Request(val foo: String, val bar: String)

val request = call.receive<Request>()

I know, there is call.receiveParameters() but, IMHO, it is not practical. I am not sure the manual is not correct or my code is wrong. How can I make the above code works?

Start with the linked Form Parameters documentation and reproduce the 415 response using the HTML form and call.receive() shown here. Compare that behavior with call.receiveParameters() and determine whether the documentation or the expected usage is incorrect. Done means the supported approach for receiving these form fields is clearly documented or the reported behavior is fixed.