diff --git a/apps/federatedfilesharing/lib/AppInfo/Application.php b/apps/federatedfilesharing/lib/AppInfo/Application.php
index 77648e7c75c1..7ec68d56b4cc 100644
--- a/apps/federatedfilesharing/lib/AppInfo/Application.php
+++ b/apps/federatedfilesharing/lib/AppInfo/Application.php
@@ -57,7 +57,8 @@ protected function initFederatedShareProvider() {
 			$addressHandler,
 			\OC::$server->getHTTPClientService(),
 			$discoveryManager,
-			\OC::$server->getJobList()
+			\OC::$server->getJobList(),
+			\OC::$server->getConfig()
 		);
 		$tokenHandler = new \OCA\FederatedFileSharing\TokenHandler(
 			\OC::$server->getSecureRandom()
diff --git a/apps/federatedfilesharing/lib/BackgroundJob/RetryJob.php b/apps/federatedfilesharing/lib/BackgroundJob/RetryJob.php
index ec192352c7fb..3d7be49d85d7 100644
--- a/apps/federatedfilesharing/lib/BackgroundJob/RetryJob.php
+++ b/apps/federatedfilesharing/lib/BackgroundJob/RetryJob.php
@@ -74,7 +74,8 @@ public function __construct(Notifications $notifications = null) {
 				$addressHandler,
 				\OC::$server->getHTTPClientService(),
 				$discoveryManager,
-				\OC::$server->getJobList()
+				\OC::$server->getJobList(),
+				\OC::$server->getConfig()
 			);
 		}
 
diff --git a/apps/federatedfilesharing/lib/Notifications.php b/apps/federatedfilesharing/lib/Notifications.php
index 2557d916086d..4b62b496695d 100644
--- a/apps/federatedfilesharing/lib/Notifications.php
+++ b/apps/federatedfilesharing/lib/Notifications.php
@@ -29,6 +29,7 @@
 use OCP\AppFramework\Http;
 use OCP\BackgroundJob\IJobList;
 use OCP\Http\Client\IClientService;
+use OCP\IConfig;
 
 class Notifications {
 	const RESPONSE_FORMAT = 'json'; // default response format for ocs calls
@@ -45,22 +46,28 @@ class Notifications {
 	/** @var IJobList  */
 	private $jobList;
 
+	/** @var IConfig */
+	private $config;
+
 	/**
 	 * @param AddressHandler $addressHandler
 	 * @param IClientService $httpClientService
 	 * @param DiscoveryManager $discoveryManager
 	 * @param IJobList $jobList
+	 * @param IConfig $config
 	 */
 	public function __construct(
 		AddressHandler $addressHandler,
 		IClientService $httpClientService,
 		DiscoveryManager $discoveryManager,
-		IJobList $jobList
+		IJobList $jobList,
+		IConfig $config
 	) {
 		$this->addressHandler = $addressHandler;
 		$this->httpClientService = $httpClientService;
 		$this->discoveryManager = $discoveryManager;
 		$this->jobList = $jobList;
+		$this->config = $config;
 	}
 
 	/**
@@ -122,8 +129,7 @@ public function sendRemoteShare($token, $shareWith, $name, $remote_id, $owner, $
 	 * @param string $shareWith
 	 * @param int $permission
 	 * @return bool
-	 * @throws \OC\HintException
-	 * @throws \OC\ServerNotAvailableException
+	 * @throws \Exception
 	 */
 	public function requestReShare($token, $id, $shareId, $remote, $shareWith, $permission) {
 
@@ -222,6 +228,7 @@ public function sendDeclineShare($remote, $remoteId, $token) {
 	 * @param array $data
 	 * @param int $try
 	 * @return boolean
+	 * @throws \Exception
 	 */
 	public function sendUpdateToRemote($remote, $remoteId, $token, $action, $data = [], $try = 0) {
 
@@ -303,6 +310,10 @@ protected function tryHttpPostToShareEndpoint($remoteDomain, $urlSuffix, array $
 				if ($e->getCode() === Http::STATUS_INTERNAL_SERVER_ERROR) {
 					throw $e;
 				}
+				$allowHttpFallback = $this->config->getSystemValue('sharing.federation.allowHttpFallback',  false) === true;
+				if (!$allowHttpFallback) {
+					throw $e;
+				}
 				$try++;
 				$protocol = 'http://';
 			}
diff --git a/apps/federatedfilesharing/tests/NotificationsTest.php b/apps/federatedfilesharing/tests/NotificationsTest.php
index 76323601de26..8289b173201f 100644
--- a/apps/federatedfilesharing/tests/NotificationsTest.php
+++ b/apps/federatedfilesharing/tests/NotificationsTest.php
@@ -29,6 +29,8 @@
 use OCA\FederatedFileSharing\Notifications;
 use OCP\BackgroundJob\IJobList;
 use OCP\Http\Client\IClientService;
+use OCP\IConfig;
+use OCA\FederatedFileSharing\BackgroundJob\RetryJob;
 
 class NotificationsTest extends \Test\TestCase {
 
@@ -44,14 +46,18 @@ class NotificationsTest extends \Test\TestCase {
 	/** @var  IJobList | \PHPUnit_Framework_MockObject_MockObject */
 	private $jobList;
 
+	/** @var  IConfig | \PHPUnit_Framework_MockObject_MockObject */
+	private $config;
+
 	public function setUp() {
 		parent::setUp();
 
-		$this->jobList = $this->createMock('OCP\BackgroundJob\IJobList');
-		$this->discoveryManager = $this->getMockBuilder('OCA\FederatedFileSharing\DiscoveryManager')
+		$this->jobList = $this->createMock(IJobList::class);
+		$this->config = $this->createMock(IConfig::class);
+		$this->discoveryManager = $this->getMockBuilder(DiscoveryManager::class)
 			->disableOriginalConstructor()->getMock();
-		$this->httpClientService = $this->createMock('OCP\Http\Client\IClientService');
-		$this->addressHandler = $this->getMockBuilder('OCA\FederatedFileSharing\AddressHandler')
+		$this->httpClientService = $this->createMock(IClientService::class);
+		$this->addressHandler = $this->getMockBuilder(AddressHandler::class)
 			->disableOriginalConstructor()->getMock();
 
 	}
@@ -68,16 +74,18 @@ private function getInstance(array $mockedMethods = []) {
 				$this->addressHandler,
 				$this->httpClientService,
 				$this->discoveryManager,
-				$this->jobList
+				$this->jobList,
+				$this->config
 			);
 		} else {
-			$instance = $this->getMockBuilder('OCA\FederatedFileSharing\Notifications')
+			$instance = $this->getMockBuilder(Notifications::class)
 				->setConstructorArgs(
 					[
 						$this->addressHandler,
 						$this->httpClientService,
 						$this->discoveryManager,
-						$this->jobList
+						$this->jobList,
+						$this->config
 					]
 				)->setMethods($mockedMethods)->getMock();
 		}
@@ -113,7 +121,7 @@ public function testSendUpdateToRemote($try, $httpRequestResult, $expected) {
 		if ($try === 0 && $expected === false) {
 			$this->jobList->expects($this->once())->method('add')
 				->with(
-					'OCA\FederatedFileSharing\BackgroundJob\RetryJob',
+					RetryJob::class,
 					[
 						'remote' => $remote,
 						'remoteId' => $id,
diff --git a/lib/private/Share20/ProviderFactory.php b/lib/private/Share20/ProviderFactory.php
index 98c394e38d9b..30fe4de8a9b7 100644
--- a/lib/private/Share20/ProviderFactory.php
+++ b/lib/private/Share20/ProviderFactory.php
@@ -102,7 +102,8 @@ protected function federatedShareProvider() {
 				$addressHandler,
 				$this->serverContainer->getHTTPClientService(),
 				$discoveryManager,
-				$this->serverContainer->getJobList()
+				$this->serverContainer->getJobList(),
+				$this->serverContainer->getConfig()
 			);
 			$tokenHandler = new TokenHandler(
 				$this->serverContainer->getSecureRandom()
diff --git a/ocs/routes.php b/ocs/routes.php
index d1f9c9ae4e72..5fddf3ef82bf 100644
--- a/ocs/routes.php
+++ b/ocs/routes.php
@@ -92,7 +92,8 @@
 		$addressHandler,
 		\OC::$server->getHTTPClientService(),
 		new \OCA\FederatedFileSharing\DiscoveryManager(\OC::$server->getMemCacheFactory(), \OC::$server->getHTTPClientService()),
-		\OC::$server->getJobList()
+		\OC::$server->getJobList(),
+		\OC::$server->getConfig()
 	);
 	$s2s = new OCA\FederatedFileSharing\RequestHandler(
 		$federatedSharingApp->getFederatedShareProvider(),