* serial access, it is critical that <b>all</b> access to the backing bimap is accomplished
   * through the returned bimap.
   *
   * <p>It is imperative that the user manually synchronize on the returned map when accessing any
   * of its collection views:
   *
   * {@snippet :
   * BiMap<Long, String> map = Maps.synchronizedBiMap(HashBiMap.create());
   * ...

   * serial access, it is critical that <b>all</b> access to the backing bimap is accomplished
   * through the returned bimap.
   *
   * <p>It is imperative that the user manually synchronize on the returned map when accessing any
   * of its collection views:
   *
   * {@snippet :
   * BiMap<Long, String> map = Maps.synchronizedBiMap(HashBiMap.create());
   * ...

	}

	// Testing the response for Invalid AccessID.
	// Forcing the signature check to fail.
	rec = httptest.NewRecorder()
	// construct HTTP request for NewMultipart upload.
	// Setting an invalid accessID.
	req, err = newTestSignedRequestV4(http.MethodPost, getNewMultipartURL("", bucketName, objectName),
		0, nil, "Invalid-AccessID", credentials.SecretKey, nil)
	if err != nil {