Is this correct, and if not (because currently I have the exact problem that BartButenaers demonstrated in message 11) would someone please let me in on the secret?
I had seen your question already yesterday evening late. But I thought: this is not stuff to get into the Christmas mood. So I left it aside for today
To be honest I am not sure at the moment whether you need to have a domain name. If the Dropbox client allows self signed certificates, then you don't need it. But I don't use this node myself, so not sure...
As far as I can recall, to fulfill Dropbox's authentication requirements, the URI must be either be;
A https URI which has a certificate signed by a trusted CA (including domain name). OR
A 'Localhost' URI
The current implementation of node-red-node-dropbox allows the former requirement, but the option to use a 'Localhost' URI has not yet been included, so cannot be used.
Having said that, we have not tested using a self signed certificate, so maybe worth trying?