Proxy Nodejitsu drone witth nginx

When developing an Angluar application, I needed to make requests to remove servers, and encountered the "Access-Control-Allow-Origin" problem. To overcome this, I decided to proxy the remote server using nginx. Since a remote server was a nodejitsu drone, I needed to modify my nginx configuration a little further than normal:

	upstream api {
	# server 127.0.0.1:3030; # Standard proxy_pass server to locally running server
	server librecms-api.jit.su:80; # proxy_pass server to remote nodejitsu drone.
	}
	server {
	listen 80;
	server_name localhost;
	root /var/www/librecms/src/angular/app;
	underscores_in_headers on;
	location /api/ {
	##### proxy_pass configuration for all upstream servers
	proxy_set_header X-Real-IP $remote_addr;
	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	proxy_set_header X-NginX-Proxy true;
	proxy_pass http://api/;
	proxy_redirect off;
	proxy_http_version 1.1;
	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection "upgrade";
	#### NOTE THIS IS SPECIFIC FOR NOTEJITSU DRONES.
	#### Must set Host header to domain of nodejitsu drone.
	proxy_set_header Host librecms-api.jit.su;
	}
	location / {
	# Application specific
	index index.html;
	try_files $uri $uri/ /index.html =404;
	}
	}

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Note the proxy_set_header Host line. This is needed because nodejitsu proxies their drones according to the Host header (docs).