Handling CORs inside of node behind nginx - node.js

Question

At the moment I'm handling CORs within node.js which seems to be working pretty well; I can setup multiple domains and hit my node.js code just fine.
The trouble is once I put node.js inside of forever and run a proxy from nginx to my application it no longer handles any CORs requests. In fact they never even make it to the server and I'm having trouble figuring out why. Below is my nginx configuration; any suggestions? If it isn't obvious I'm trying to hit the services.org from the webapp.org. In this environment they're on the same box but in other environments and when consumed by third parties we need CORs working.
server {
listen 80;
server_name webapp.org;
location / {
proxy_pass http://localhost:3000/Site/;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
}
}
server {
listen 80;
server_name services.org;
location / {
proxy_pass http://localhost:3000;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
}
}

Answer 1

Try 127.0.0.1 instead of localhost in the nginx.conf

Answer 2

Try adding an upstream server like this:
upstream my_app {
server 127.0.0.1:3000;
}
server {
listen 0.0.0.0:80;
server_name webapp.org;
access_log /var/log/nginx/my_app.log;
# pass the request to the node.js server with the correct headers and much more can be added, see nginx config options
location / {
root /var/www/my_app/public;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://my_app;
break;
}
}
}

Answer 3

You may need to enable CORS for the service via:
app.enableCors() in your bootstrap() function in main.ts