Thanks to you all, I got it working now.

Best regards,

Simon

Where should I get the output HTML-page?

Thanks,

Simon

Hi Henrique,

I don't have any code for this api yet but I do have one for (for example) JSON:

<Route Url="/newOrder" Method="post" Call="newOrder"/>

ClassMethod newOrder() As %Status {

    S dataToProcess=%request.Content.Read(32000)
    s dataToJSON=$TR(dataToProcess,"'"," ")
    s dataToJSON=$TR(dataToProcess,"""","'")
    s ^simonupload(2)=dataToJSON
    S dataToJSON=##class(Util.JSON).Decode(dataToJSON)
    s ^simonupload(3)=dataToJSON
    s ^simonupload(4)=dataToJSON.GetAt("Opmerkingen")
    s ^simonupload(5)=dataToJSON.GetAt("Bijlagen").GetAt(1)    
    quit $$$OK
}

This works for receiving JSON.

But I don't know how to do it with Form Data.