Java: String representation of just the host, scheme, possibly port from servlet request

Question

I work with different servers and configurations. What is the best java code approach for getting the scheme://host:[port if it is not port 80].

Here is some code I

Answer 1

public String getServer(HttpServletRequest request) {
  int port = request.getServerPort();
  StringBuilder result = new StringBuilder();
  result.append(request.getScheme())
        .append("://")
        .append(request.getServerName());

  if (port != 80) {
    result.append(':')
          .append(port);
  }

  return result;
}