A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur is that either a program, cron job, or resource is taking up more resources than it should causing the server not to be able to respond to all requests properly.
Review the Quick Fix Ideas in this Community Tip for troubleshooting suggestions.
Note that if the website FanFiction.Net does not belong to you, then there’s absolutely nothing you or Cloudflare can do about this. Only the site’s owners can address any issues with their site… and they’re the ones you should report this problem to.
