NGINX Upstream Recommended Config

proxy_http_version 1.1;
proxy_set_header Host       $http_host;
proxy_set_header Connection "upgrade";
proxy_set_header Upgrade $http_upgrade;
proxy_set_header X-Forwarded-Proto $scheme;
#proxy_set_header X-Forwarded-Proto https;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Port $server_port;
#proxy_set_header X-Forwarded-Port 443;
proxy_set_header X-Request-Start $msec;
proxy_headers_hash_max_size 512;
proxy_headers_hash_bucket_size 128;
proxy_buffering off;
proxy_redirect off;
proxy_max_temp_file_size 0;