docs: protected String buildBasicAuthValue(String user, String password){
  		StringBuilder sb = new StringBuilder();
  		if (StringUtils.isNotEmpty(user)){
  			sb.append(user);
  		}
  		if (StringUtils.isNotEmpty(password)){
  			if (sb.length() > 0){
  				sb.append(':');
  			}
  			sb.append(password);
  		}
  		return buildBasicAuthValue(sb.toString());
  	}