code: public void deleteIfNoneMatch(URI uri, String eTag,
  			Header[] additionalRequestHeaders, Credentials credentials) {
  		ra.getExecutorService().execute(
  				new AsyncDeleteIfNoneMatchHandler(ra, handle, uri, eTag,
  						additionalRequestHeaders, credentials));
  	}
docs: /*
  (non-Javadoc)
  
  @see
  AsyncActivity#deleteIfNoneMatch
  (java.net.URI, java.lang.String,
  Header[],
  Credentials)