clone method
Implementation
OutgoingRequest clone() {
OutgoingRequest request = OutgoingRequest(method, ruri, ua);
headers.forEach((String? name, dynamic value) {
request.headers[name] = headers[name];
});
request.body = body;
request.extraHeaders = utils.cloneArray(extraHeaders);
request.to = to;
request.from = from;
request.call_id = call_id;
request.cseq = cseq;
return request;
}