code: public static boolean isMultipartFormDataContent (@Nullable final String sContentType)
    {
      return sContentType != null && sContentType.toLowerCase (Locale.US).startsWith (MULTIPART_FORM_DATA);
    }
docs: Utility method that determines whether the request contains
  <code>multipart/form-data</code> content.
  
  @param sContentType
  The content type to be checked. May be <code>null</code>.
  @return <code>true</code> if the passed, lowercased content type starts
  with <code>multipart/form-data</code>; <code>false</code>
  otherwise.