Issues getting nginx to serve my flask app

I have a flask app that I would like to serve via a DO Droplet. I have followed How To Serve Flask Applications with Gunicorn and Nginx on Ubuntu 22.04

This is my folder structure

└── baseweb/
     ├── venv
     └── app/ 
         └── templates/ 
             └── index.html looks like this

from app import app

if __name__ == "__main__":'', debug=True)

I have created a baseweb service

Description=Gunicorn instance to serve myproject

ExecStart=/root/baseweb/venv/bin/gunicorn --workers 1 --bind unix:baseweb.sock app:app


and my nginx configuration (/etc/nginx/sites-available/baseweb)

server {
    listen 80;

    location / {
        proxy_pass http://unix:/root/baseweb/baseweb.sock;

i have the DNS set up at to point to the IP address

When i simply run using my venv, i can access my flask app via

if I run gunicorn --bind app:app i can also access my app via the same IP.

But when i try to access via nginx (via without running the app in console), i get

502 Bad Gateway

nginx/1.22.0 (Ubuntu)

I have spent hours trying to adjust settings, but i have no idea where this is going wrong - so any help is very much appreciated.

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Site Moderator
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February 22, 2023

Hey @kristian60,

Try configuring your Nginx config the following way:

server {
  listen 80;
  location / {
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;

Please do let me know how it goes.

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