Nginx cannot send whole response in a slow connection

Question

Some user reported that cannot download whole response from my site when they are in a slow network connection.

I tested with curl --limit-rate 1k, and curl did report

 transfer closed with 769569 bytes remaining to read

Why is that, and how to solve this? I think it might relate to some nginx timeout config and googled a little bit, but cannot find out.

Answer 1

Are you using sendfile? Increase the amount of seconds of send_timeout until you find something ideal, something proportional to the largest file on your server. Here's an example

http {
  ...
  send_timeout 35s;
  ...
}

You also might want to read the Cloudflare post where they are describing your identical issue.

Hope this helps