WebDAV

Oboku lets you use WebDAV server to synchronize your books but you need to make sure your WebDAV server is configured in a way that works.

CORS

Your server needs to returns a valid CORS. You cannot use a wildcard * because oboku needs to sends credentials. This means you will have to specify the origin. If you use the cloud version, you can use https://app.oboku.me. If you use the self host version, use whatever host / ip you use.

OPTIONS

Your browser will not sends the credentials for a preflight request (see https://fetch.spec.whatwg.org/#http-cors-protocol). This means your server must returns a valid HTTP status when responding to OPTIONS requests. This is a common issue with synology WebDAV server which requires authentication even for OPTIONS requests.

You can configure a reverse proxy in front of your WebDAV server and intercept OPTIONS requests to return a 200 status