Can not open database file from webdav(nextcloud)

[N7-BADA]

can not open a database file from webdav(nextcloud). when entering the password it shows a toast message "can not open ... is the password correct or key file needed"

when i copy the same database file from webdav(nextcloud) to my phone it opens fine with the same password.

[chemarito]

Same situation with Nextcloud 24 and ssl access via reverse proxy (caddy).

please fix it, thx!.