Quoting the OP: > Also, preload links from the Link response headers, as described in https://www.w3.org/TR/preload/#server-push-http-2 https://www.w3.org/TR/p

Quoting the OP: > Also, preload links from the Link response headers, as described in https://www.w3.org/TR/preload/#server-push-http-2 https://www.w3.org/TR/preload/#server-push-http-2, can be pushed, if enabled with the "http2_push_preload" directive. So you send down some headers in your response which tells the proxy server resources it should push. Pretty elegant, and fails gracefully. I believe this is the same mechanism as other http2 servers.