Error 502 Bad gateway in online server

error reproduction

  1. the server increases the load time in some response and Cloudflare gives error.
  2. the error is saved and always shows a screen like this.
  3. restart server etc and follow the error, pause Cloudflare and load the normal page.
  4. if I delete all the browser data and the page is already normal, but visitors do not know they should do this, and the error is very frequent leaving the website with a 502 error for many visitors and crawlers like googlebot

Chances are your server has issues with sessions or cookies for returning visitors. Check the actual application’s error logs, or PHP error logs.

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