I am trying to use the DELETE method with HttpRequst and Http.  How do you get around this exception?

Thanks!

System.CalloutException: /HTTP method DELETE doesn't support output

The code. url is an endpoint, method is set to DELETE, params are set to a list of parameters.  

/HttpRequest req = new /HttpRequest();

url = urlMap.get(id);

req.setEndpoint(url);

req.setHeader('Content-Type', 'application/x-www-form-urlencoded');

req.setMethod(method);

req.setBody(params);  

/Http http = new /Http();

/http.send(req);