Setting a specific url to href makes barbican return that single url regardless of the actual endpoint used. This sometimes causes wrong redirect (especially when a client uses admin url or internal url). Set it to a blank value so that barbican uses the auto-detected endpoint url, which is changed according to the real end point used. Change-Id: Icf656b1004a0f94c724353c3de7e17fdd5af1a81 Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>