[1] Error 524 – CloudFlare Support ( ( 版)) <https://support.cloudflare.com/hc/en-us/articles/200171926-Error-524>
[2] Cloudflare HTTP POST 524 Timeout with node.js + express - Stack Overflow ( ( 版)) <http://stackoverflow.com/questions/27253756/cloudflare-http-post-524-timeout-with-node-js-express>