docs: @Nullable
    public static BasicAuthClientCredentials getBasicAuthClientCredentials (@Nonnull final HttpServletRequest aHttpRequest)
    {
      ValueEnforcer.notNull (aHttpRequest, "HttpRequest");
  
      final String sHeaderValue = aHttpRequest.getHeader (CHttpHeader.AUTHORIZATION);
      return HttpBasicAuth.getBasicAuthClientCredentials (sHeaderValue);
    }