Update nginx conf based on gunicorn docs

nginx/conf.d/app.conf

@@ -1,16 +1,55 @@
-upstream django {
-    server django:8000;
+worker_processes 1;
+
+events {
+  worker_connections 1024; # increase if you have lots of clients
+  accept_mutex off; # set to 'on' if nginx worker_processes > 1
+  # 'use epoll;' to enable for Linux 2.6+
+  # 'use kqueue;' to enable for FreeBSD, OSX
 }
 
-server {
+http {
+  include mime.types;
+  # fallback in case we can't determine a type
+  default_type application/octet-stream;
+  access_log /var/log/nginx/access.log combined;
+  sendfile on;
+
+  upstream app_server {
+    # fail_timeout=0 means we always retry an upstream even if it failed
+    # to return a good HTTP response
+
+    # for UNIX domain socket setups
+    # server unix:/tmp/gunicorn.sock fail_timeout=0;
+
+    # for a TCP configuration
+    server django:8000 fail_timeout=0;
+  }
 
+  server {
+    # if no Host match, close the connection to prevent host spoofing
+    listen 80 default_server;
+    return 444;
+  }
+
+  server {
+    # use 'listen 80 deferred;' for Linux
+    # use 'listen 80 accept_filter=httpready;' for FreeBSD
     listen 80;
+    client_max_body_size 4G;
+
+    # set the correct host(s) for your site
+    server_name 34.82.120.199;
+
+    keepalive_timeout 5;
 
     location / {
-        proxy_pass http://django;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header Host $host;
-        proxy_redirect off;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header X-Forwarded-Proto $scheme;
+      proxy_set_header Host $http_host;
+      # we don't want nginx trying to do something clever with
+      # redirects, we set the Host: header above already.
+      proxy_redirect off;
+      proxy_pass http://app_server;
     }
-
+  }
 }