Hola @Jaume Marcet! 

Echa un vistazo a este código de ejemplo que me ha sugerido nuestro amigo el chatbot de IA:

Class objectscript.postXML
{
    ClassMethod test() {
        Set HTTPRequest = ##class(%Net.HttpRequest).%New()
        Set HTTPRequest.ContentType = "text/xml"Set HTTPRequest.NoDefaultContentCharset = 1Set HTTPRequest.Server = "wph.foactive.com"// Specify server address hereSet HTTPRequest.Location = "/ITOMCZ"// Specify location or endpoint here// Modify headers if necessaryDo HTTPRequest.RemoveHeader("User-Agent")
        Do HTTPRequest.RemoveHeader("Accept-Encoding")
        Do HTTPRequest.RemoveHeader("Connection")
        Do HTTPRequest.SetHeader("Expect", "100-continue")
        
        // Open XML file and copy its content into the request bodySet RequestXML = ##class(%Library.File).%New("c:\\path\\to\\your\\file.xml")   // Specify file path hereDo RequestXML.Open("RS")
        Do HTTPRequest.EntityBody.CopyFrom(RequestXML)
        Do RequestXML.%Close()
        
        // Send the requestSet sc = HTTPRequest.Post(HTTPRequest.Location)
        
        // Check the responseIf$$$ISOK(sc) {
            Write HTTPRequest.HttpResponse.StatusCode, !
            Write HTTPRequest.HttpResponse.Data.Read(), !
        } Else {
            // Handle errorsWrite"Error in request: ", $System.OBJ.DisplayError(sc), !
        }
    }
}