Why is Apache sending duplicate Vary: Accept Encoding headers?
We put our Magento site on Sucuri and it is much slower than running it off our own server. Looking further, we notice that Apache is sending two Vary: Accept-Encoding headers and, as per Sucuri support, these duplicate headers are preventing the site from being cached properly by Sucuri CDN.
Here's the curl output:
curl -IL https://domain.com HTTP/1.1 200 OK Server: nginx Date: Mon, 26 Jun 2017 15:21:07 GMT Content-Type: text/html; charset=UTF-8 Connection: keep-alive Vary: Accept-Encoding |------> First header Set-Cookie: frontend=fotji70ieh366b5k165u3mcd63; expires=Mon, 26-Jun-2017 16:22:19 GMT; Max-Age=3600; path=/; domain=domain.com; HttpOnly Expires: Mon, 26 Jun 2017 18:22:19 GMT Cache-Control: public, max-age=10800 Last-Modified: Wed, 14 Sep 2016 07:13:12 GMT Set-Cookie: frontend_cid=sugOUAWt3WMknsbW; expires=Mon, 26-Jun-2017 16:22:19 GMT; Max-Age=3600; path=/; domain=domain.com; secure; httponly X-Frame-Options: SAMEORIGIN Strict-Transport-Security: max-age=31536000 Vary: Accept-Encoding,User-Agent |------> Second header X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block X-Sucuri-Cache: MISS X-Sucuri-ID: 16007
I have gone nuts trying to figure out why these duplicate headers are occurring. I removed moddeflate and modexpires <IfModule> declarations from the Apache vhost and Magento's .htaccess but the duplicate headers are still showing up.
I would greatly appreciate any pointers towards fixing this. Thanks in advance.