code: private static void appendAuthParam(StringBuilder sb, String key, String value) {
  		if (sb.length() > 0) {
  			sb.append(",");
  		}
  		sb.append(key);
  		sb.append("=\"");
  		sb.append(value);
  		sb.append("\"");
  	}
docs: Appends an authorization parameter to the given string builder
  @param sb the string builder
  @param key the parameter's key
  @param value the parameter's value