prepareWriter method
Implementation
@internal
void prepareWriter(HttpResponse httpResponse) {
writer!.redirect = httpResponse.redirect;
writer!.add = httpResponse.add;
writer!.addStream = httpResponse.addStream;
writer!.write = httpResponse.write;
writer!.writeAll = httpResponse.writeAll;
writer!.writeln = httpResponse.writeln;
writer!.headers = httpResponse.headers;
writer!.connectionInfo = httpResponse.connectionInfo;
writer!.cookies = httpResponse.cookies;
writer!.setStatus = (int i) => status = i;
}