How to send a BREW request for a coffee with cream and a shot of vanilla to a HTCPCP server

I am trying to send a BREW request to a server implementing the Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0, defined in RFC 2324), which is a protocol built on top of HTTP, using cURL.

I would like to BREW a coffee with Cream and a shot of Vanilla syrup, but so far all my requests have all been rejected by the server.

Confusingly, the RFC says the Content-Type must be set to "application/coffee-pot-command" (Section 2.11), but also says Content-Type must be set to "message/coffeepot" (Section 4, and additionally says the content of "message/coffeepot" must contain a coffee-message-body, defined as coffee-message-body = "start" | "stop"). I've gone with "application/coffee-pot-command", purely become it comes first (but I've tried both).

Next, I have added an "Accept-Additions" header, specifying the milk-type as "Cream" and the syrup-type as "Vanilla". The RFC outlines a BNF for this header:

   Accept-Additions = "Accept-Additions" ":"
                      #( addition-range [ accept-params ] )

    addition-type   = ( "*"
                      | milk-type
                      | syrup-type
                      ) *( ";" parameter )
    milk-type       = ( "Cream" | "Half-and-half" | "Whole-milk"
                      | "Part-Skim" | "Skim" | "Non-Dairy" )
    syrup-type      = ( "Vanilla" | "Almond" | "Raspberry"
                      | "Chocolate" )

My best guess for this part would be I would need to add the following header:

--header "Accept-Additions: Skim;1,Vanilla;1"

Although I am not experienced with interpreting BNF so this could be completely wrong.

All this has lead me to build the following request with cURL:

curl -X POST https://theserver.com --header "Content-Type:application/coffee-pot-command" --header "Accept-Additions:Skim;1,Vanilla;1"

However the server keeps telling me "Invalid drink, cannot brew". Where am I going wrong?

There is a section called "The "coffee" URI scheme" which contains more BNF:

coffee-url  =  coffee-scheme ":" [ "//" host ]
                ["/" pot-designator ] ["?" additions-list ]

coffee-scheme = ( "koffie"                      ; Afrikaans, Dutch
               | "coffee"                   ; English
               )

But I have no idea how to interpret this. Do I need to add "coffee:/pot-0" somewhere? If so how does one do that in cURL? Is this what I am missing? I am aware the RFC is an April Fools, but the server is real. A free coffee to whoever can help.