Thanks, that helps narrow it down! Based on the 401 statuses and AUTHORIZED_FETCH documentation, I’m assuming WriteFreely is missing some important actor data on that initial fetch (such as public keys), causing later calls to fail.
This is on my list to personally investigate more, but we could use help from anyone in the community interested in solving this (especially if you run a WriteFreely instance)! I think as a next step, it’s worth opening a bug report about this.