nginx/angular/node.js root URL with prerender.io
You need to set the window.prerenderReady variable. Thus, put this in your route controller:
window.prerenderReady = false;... and this in your controller's success callback function:
window.prerenderReady = true;
I encountered the same problem not long ago.
Do you have a code fragment that prerender.io would not be able to run?
In my case, I was using platform.js (https://github.com/bestiejs/platform.js/), and was doing a test in my appComponent.ts about "platform.name". This was not existing in Prerender.io, and I was getting a blank page.