Nginx keepalive connections config example to upstream servers.

README.md

Nginx upstream HTTP keepalive config example

As per Nginx documentation, the key directives of proxy_http_version and proxy_set_header need to be set as per below:

upstream backend {
	server 127.0.0.1:8080;
	keepalive 8;
}

server {
	listen 80;

	location / {
		proxy_pass http://backend;
		proxy_http_version 1.1;
		proxy_set_header Connection "";
	}
}

Reference

• https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version
• https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive