Per accident today I found out about WOPI (Web Application Open Platform Interface). And why online document collaboration (Collabora / LibreOffice or OnlyOffice / also MS Office Web) is such a heavy piece of software. Even for today's standards. It's all about locking document and ensuring statefulness. For a sheet or for a document. So I setup my old Filerun server (Filerun is a nifty NextCloud alternative for small-scale adoption) and added my OnlyOffice (Docker) instance. WOPI didn't play nice. I always thought setting up "just office" was a 5 minute job. Turns out you need to get serious. Anyway, so I am running PHP software in 2026. And it works fine. And I use WOPI. #filerun #onlyoffice #wopi #php