adding keepalives to upstream connection

Author: Rider-Linden

README.md

@@ -88,4 +88,4 @@ Notable differences from the official [nginx container][]
 [nginx container]: https://hub.docker.com/_/nginx
 [gomplate]: https://docs.gomplate.ca/
 [uwsgi]: https://uwsgi-docs.readthedocs.io/en/latest/
-[nginx status]: https://nginx.org/en/docs/http/ngx_http_stub_status_module.html
+[nginx status]: https://nginx.org/en/docs/http/ngx_http_stub_status_module.html

src/etc/nginx/conf.d/default.conf.template

@@ -1,4 +1,4 @@
-# Default configuration returns 400 in order to deny any request with an 
+# Default configuration returns 400 in order to deny any request with an
 # unrecognized host header (server_name.)
 {{ if (ne .Env.SERVER_NAME "_") }}
 server {
@@ -10,6 +10,8 @@ server {
 
 upstream app {
   server {{ .Env.UPSTREAM_SERVER }};
+
+  keepalive 8; # The maximum number of idle keepalive connections to upstream servers.
 }
 
 server {
@@ -21,7 +23,10 @@ server {
   add_header X-Frame-Options "SAMEORIGIN";
   add_header X-XSS-Protection "1; mode=block";
   add_header X-Content-Type-Options "nosniff";
-  
+
+  proxy_http_version 1.1;
+  proxy_set_header "Connection" "";
+
   location / {
     {{ if (eq .Env.PROXY_UWSGI "1") }}
     include /etc/nginx/includes/uwsgi.conf;