How to enable ETag headers on Nginx for static files?
Upgrade your Nginx. Syntax: etag on | off; Default: etag on; Context: http, server, location This directive appeared in version 1.3.3. Enables or disables automatic generation of the “ETag” response header field for static resources. Source: http://nginx.org/en/docs/http/ngx_http_core_module.html#etag