public function buildDestroySessionRequest(SsoServer $ssoServer, $sessionId) {
		$serviceUri = new Uri(rtrim($this->serviceBaseUri, '/') . '/session/' . urlencode($sessionId) . '/destroy');
		$serviceUri->setQuery(http_build_query(array('serverIdentifier' => $ssoServer->getServiceBaseUri())));
		$request = \TYPO3\Flow\Http\Request::create($serviceUri, 'DELETE');
		$request->setContent('');

		return $this->requestSigner->signRequest($request, $ssoServer->getKeyPairFingerprint(), $ssoServer->getKeyPairFingerprint());
	}