Seafile not working after Fresh Install on UCS5

After fresh Install of UCS5 and only Seafile as additional App I get an Error when opening the Seafile Application https://192.168.10.252/seafile :

Bad Request

Contradictory scheme headers

while googling i found that this happens, when using multiple reverse-proxy for external https
Can someone tell me how to fix this? or does this needs to be fixed in the container?