Browser caching not working

General

Request URL:https://www.chriswang.tech/ Request Method:GET Status Code:304 Remote Address:104.17.92.143:443 Referrer Policy:no-referrer-when-downgrade

Response:

access-control-allow-origin:* cache-control:public, max-age=14400 cf-cache-status:REVALIDATED cf-ray:369d2011ead2187c-EWR date:Sun, 04 Jun 2017 18:58:44 GMT expires:Sun, 04 Jun 2017 22:58:44 GMT last-modified:Wed, 31 May 2017 00:20:44 GMT server:cloudflare-nginx status:304 strict-transport-security:max-age=2592000; includeSubDomains vary:Accept-Encoding via:1.1 varnish x-cache:MISS x-cache-hits:0 x-content-type-options:nosniff x-fastly-request-id:d9f2758ecc2bfc2016892bd9daf0832b6d8bd0a2 x-github-request-id:6A9A:2F52:2AA5A3F:392DD35:5930B72B x-served-by:cache-jfk8151-JFK x-timer:S1496364844.946100,VS0,VE11

Request

:authority:www.chriswang.tech :method:GET :path:/ :scheme:https accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8 accept-encoding:gzip, deflate, sdch, br accept-language:en-US,en;q=0.8,en-GB;q=0.6,zh;q=0.4,zh-CN;q=0.2,zh-TW;q=0.2 cache-control:max-age=0 cookie:__cfduid=de81a3d815627a1ed6963258e6a4ff0731485963204; _ga=GA1.2.1789872603.1485638537; CF_STATUS=active dnt:1 if-modified-since:Wed, 31 May 2017 00:20:44 GMT upgrade-insecure-requests:1 user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36