nginxbad-gateway

What does the nginx 502 559 error code mean?

I'm getting a "502 559" error in my nginx error logs. I know that the 502 means "bad gateway". What does the 559 mean?

Solution

  • As mentioned by Richard Smith in the comment, 559 in the nginx log stands for:

    the number of bytes in the HTML response that Nginx sent to the browser

    Source: http://nginx.org/en/docs/http/ngx_http_log_module.html#log_format

    or, as specified in the docs:

    $body_bytes_sent
    number of bytes sent to a client, not counting the response header; this variable is compatible with the “%B” parameter of the mod_log_config Apache module