How to "Post" a URL based on the Alert Message

I am trying to create a URL for Spoke Mobile to page users when our email system is down and we can't use the normal email alerts.

I was directed to http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=EHTTP_outbound and tried to create something.  The best I got was a response from the webpage that told me there was an error.

I want to be able to have a default pager number when we don't have an oncall schedule and grab information from Ens.AlertMessage.

I thought this would work:

Class User.NewClass21 Extends Ens.BusinessOperation
{

Parameter ADAPTER = "EnsLib.HTTP.OutboundAdapter";

Property Adapter As EnsLib.HTTP.OutboundAdapter;

Parameter INVOCATION = "Queue";

/// Analyst Pager number
Property PIN As %String;

Parameter SETTINGS As %String = "PIN";

/// Alert Message
Property MSSG As %String;

Method OnD03Alert(pReq As User.Alert, Output pResp As %String) As %Status
{
            
        Set httprequest = ##class(%Net.HttpRequest).%New()
                
        Do httprequest.SetParam("PIN",..PIN)
        
        Do httprequest.SetParam("MSSG","motogplay")

        Do httprequest.Post(,1,0)
        set stream = httprequest.HttpResponse.Data
            
        while 'stream.AtEnd {
                Set pResp = stream.Read($$$MaxStringLength)
        }
    
    Quit $$$OK
}

XData MessageMap
{
<MapItems>
    <MapItem MessageType="User.Alert">
        <Method>OnD03Alert</Method>
    </MapItem>
</MapItems>
}

}
 

put get an error the my function needs to return a response.

here is the URL I am trying to get to http://www.usamobility.net/cgi-bin/wwwpage.exe?PIN=nnnnnnnnnn&MSSG=motoplay where nnnnnnnnnn is the pager number

Thanks for your time.