How to put site into maintenance mode?

I have a SPA built in React. I have a random page on the app that will go to an under construction page. Since it is an SPA and the routing happens within the app itself, how would I redirect the app to the under construction page without changing the app itself? I know there’s a .toml/_redirects page would i be able to have it redirect to /underconstruction within the app itself? Or am i forced to do it in the code itself. IE heroku has a switch to put it into maintenance mode fairly trivially does netlify offer this?

hi @Gbyrd - have you looked into our branch deploy / split testing feature? You might be able to deploy a “placeholder” site from one branch and then switch to a different branch as soon as your project is ready. Give this a read through: