Optimize default nginx config (#1040)

Problem: We want to ensure that the default nginx configuration uses the best possible options for performance and stability.

Solution: Using NGINX Ingress Controller as a guide, added options to increase performance, set the common X-Forwarded-For header, and allow standard media types.

Author: sjberman

internal/mode/static/nginx/conf/nginx.conf

@@ -1,20 +1,31 @@
 load_module /usr/lib/nginx/modules/ngx_http_js_module.so;
 
-events {}
+worker_processes auto;
 
 pid /var/run/nginx/nginx.pid;
-error_log stderr debug;
+error_log stderr info;
+
+events {
+  worker_connections 1024;
+}
 
 http {
   include /etc/nginx/conf.d/*.conf;
+  include /etc/nginx/mime.types;
   js_import /usr/lib/nginx/modules/njs/httpmatches.js;
+
+  default_type application/octet-stream;
+
   proxy_headers_hash_bucket_size 512;
   proxy_headers_hash_max_size 1024;
   server_names_hash_bucket_size 256;
   server_names_hash_max_size 1024;
   variables_hash_bucket_size 512;
   variables_hash_max_size 1024;
 
+  sendfile on;
+  tcp_nopush on;
+
   server {
     listen unix:/var/run/nginx/nginx-status.sock;
     access_log off;

internal/mode/static/nginx/config/servers_template.go

@@ -51,6 +51,7 @@ server {
         proxy_set_header {{ $h.Name }} "{{ $h.Value }}";
             {{- end }}
         proxy_set_header Host $gw_api_compliant_host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $connection_upgrade;