code: public static boolean isMultipartContent (@Nullable final String sContentType)
    {
      return sContentType != null && sContentType.toLowerCase (Locale.US).startsWith (MULTIPART);
    }
docs: Utility method that determines whether the request contains multipart
  content.
  
  @param sContentType
  The content type to be checked. May be <code>null</code>.
  @return <code>true</code> if the request is multipart; <code>false</code>
  otherwise.