D5430.1775215360.diff
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	diff --git a/lib/ext/Syncroton/Command/FolderSync.php b/lib/ext/Syncroton/Command/FolderSync.php
	--- a/lib/ext/Syncroton/Command/FolderSync.php
	+++ b/lib/ext/Syncroton/Command/FolderSync.php
	@@ -119,15 +119,25 @@
	if ($this->_logger instanceof Zend_Log) {
	$this->_logger->info(__METHOD__ . '::' . __LINE__ . " already known synckey $syncKey provided ($retryCounter times)");
	}
	+ $sleepTime = 2;
	if ($retryCounter >= 10) {
	if ($this->_logger instanceof Zend_Log) {
	$this->_logger->warn(__METHOD__ . '::' . __LINE__ . " This client is stuck on resending the same FolderSync synckey.");
	}
	+ call_user_func(Syncroton_Registry::getSleepCallback());
	+ sleep(10);
	+ header('X-MS-ASThrottle: CommandFrequency');
	+ header('HTTP/1.1 503 Service Unavailable');
	+ exit;
	} else {
	$extraData['retryCounter'] = $retryCounter;
	$this->_syncState->extraData = json_encode($extraData);
	$this->_syncStateBackend->update($this->_syncState);
	}
	+ // Throttle clients that are stuck in a loop.
	+ // We shouldn't normally hit this codepath, so this does not have any impact on regular synchronization at all,
	+ // but protects us from too many requests from clients that are stuck in a loop.
	+ sleep($sleepTime);
	}
	}
	}