Nginx serve different files based on user login?
Only application could check if user is logged in or not, but you could use X-Accel-Redirect header to make nginx serve one file or another.
Some pseudocode:
if (user.isLoggedIn) { response.setHeader("X-Accel-Redirect", "/app.html");} else { response.setHeader("X-Accel-Redirect", "/index.html");}response.end();Also you need to pass request to / to application.
location = / { # copy from location /api}