Fond metadata updates only saved when using actual server address in the backend

Created by: icarus-eu

When trying to save changes to fond metadata using the official url (for example http://monasterium.net/mom/CZ-NA/ACK/edit-fond), the user is presented with an error message stating Error: Document could not be saved (screenshot).

When using the server's main address (http://ftp.dioezesanarchiv.acw.at:8181/mom/CZ-NA/ACK/edit-fond), the changes are stored successfully.