Question

How to solve 502 error on nginx - digitalocen while generating pdf file?

I have problem with generating pdf files on digital ocean nginx server. I have MERN app and I use “html-pdf-node” library to create pdf files. It works on localhost but error is on digital ocean nginx server. Every time i try generate pdf i have the same error:

502 Bad Gateway
nginx/1.18.0 (Ubuntu)

It is my log error:

upstream prematurely closed connection while reading response header from upstream, client

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Hello there,

You can verify that Nginx is running fine. 502 Bad Gateway Nginx is a generic Nginx error.

To check the status:

  1. sudo systemctl status nginx

If there is an error message you can also check the journal logs to extract additional information:

  1. journalctl -xe

To restart the service:

  1. sudo systemctl restart nginx

I would recommend checking your error logs:

  1. tail -f /var/log/nginx/error.log
  2. Also, I'll include this question from our community, make sure to check Bobby's reply as it includes really useful information (video of troubleshooting as well)
  3. https://www.digitalocean.com/community/questions/502-bad-gateway-nginx-2
  4. Regards

Hi @happygreenbluejellyfish,

Are you using Nginx as a proxy? If yes, try setting higher values for the proxy like so:

    proxy_read_timeout 300s;
    proxy_connect_timeout 75s;
    proxy_pass http://localhost:9000;

If you are not using a proxy and the error you see in Nginx is the only thing you see in there, I’ll recommend checking out your Application and the error logs on it.