As Pita mentioned... this is an Nginx configuration issue, so it is the Nginx config rather than the NodeBB config that we'll need to see.
Load pages except global header without refreshing entire page
I need this react-like feature that loads pages except the header (because in the global header I put iframe video and I don't want it to be stopped during moving each pages and posts of the forums), is there such a plugin doing this?
With nodebb-plugin-customize, you can edit the header template and put your video there.
Thanks, it worked!