/etc/nginx/conf.d/common-location.conf

# https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version
proxy_http_version 1.1;
# https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_bypass
proxy_cache_bypass $http_upgrade;
# https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
proxy_read_timeout 90;
# https://docs.oracle.com/en-us/iaas/Content/Balance/Reference/httpheaders.htm
proxy_set_header X-Real-IP $remote_addr;
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto
proxy_set_header X-Forwarded-Proto $scheme;
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Host
proxy_set_header Host $host;
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host
proxy_set_header X-Forwarded-Host $host;
# https://docs.oracle.com/en-us/iaas/Content/Balance/Reference/httpheaders.htm
proxy_set_header X-Forwarded-Port $server_port;
# https://nginx.org/en/docs/http/websocket.html
## https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Upgrade
proxy_set_header Upgrade $http_upgrade;
## https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection
proxy_set_header Connection 'upgrade';