Internal Server Error while doing post request in flask using nginx and uwsgi

Question

I am using this tutorial

Background: I am using flask post API to activate selenium to extract information and send them to website. This work perfectly when I don't apply nginx configuration and just run the below code on server (as in local machine using port 5000).

Problem: when I try to deploy the flask application by mean of nginx and uwsgi and following the indication of this tutorial I get an internal server error whenever I do the POST request http://my_domain/find_data.

Below I'll show part of my code.

from app import app
if __name__ == "__main__":
        app.run()

The app.py code (it manages the POST request http://my_domain/find_data) is:


from flask import Flask, send_from_directory, stream_with_context, request, Response
from flask_restful import Api, Resource, reqparse
from flask_cors import CORS #comment this on deployment
from data_finder import DataFinder
from time import sleep
from contextlib import closing
import requests
import json 
from flask import jsonify
from flask import jsonify, make_response

app = Flask(__name__, static_url_path='', static_folder='frontend/build')
CORS(app) #comment this on deployment
api = Api(app)


@app.route("/")
def hello():
    return send_from_directory(app.static_folder, 'index.html')

@app.route("/find_data", methods = ['POST'])
def FindData():
    person = request.get_json()['person']
    print(person)
    results = {}
    data_finder = DataFinder()


    results['Spokeo'] = list(data_finder.get_spokeo_data(person))
    results['White Pages'] = list(data_finder.get_whitepages_data(person).keys())

    return make_response(jsonify(results), 200)

My project.ini file is this:

[uwsgi]
module = wsgi:app

master = true
processes = 5

socket = myproject.sock
chmod-socket = 660
vacuum = true

die-on-term = true

Lastly my nginx configuration file is


server {
    listen 80;
    server_name my_domain www.my_domain;


    location / {
        include uwsgi_params;
        uwsgi_pass unix:/home/help/data-finder/privaseame_web_app/myproject.sock;
        uwsgi_read_timeout 900;
        proxy_read_timeout 1800;
        proxy_connect_timeout 1800;
        proxy_send_timeout 1800;
        send_timeout 1800;
    }

    client_header_timeout 900s;
    client_body_timeout 900s;
    keepalive_timeout 900s;
    send_timeout 900s;
}

I am using digital ocean linux droplet Ubuntu 18-0.4 LTS Running python3.10.6 I used below stack overflow links but information on them is not sufficient

Guide1 Guide2

If I miss any information please let me know I will provide.

Thanks for your insight

User051209 · Accepted Answer · 2023-04-27 12:58:07Z

Pay attention at the names of the file!

I have followed the same tutorial.

From your answer are not clear names of the different files that you have created. I suggest you to follow exactly the tutorial and in particular the names schema (for the files) that it suggests. I try to give you some advices.

The name of your file:

from app import app
if __name__ == "__main__":
        app.run()

must be uwsgi.py because in the file project.ini you use the option:

[uwsgi]
module = wsgi:app

The name of your file:

from flask import Flask, send_from_directory, stream_with_context, request, Response
from flask_restful import Api, Resource, reqparse
from flask_cors import CORS #comment this on deployment
from data_finder import DataFinder
from time import sleep
from contextlib import closing
import requests
import json 
from flask import jsonify
from flask import jsonify, make_response

app = Flask(__name__, static_url_path='', static_folder='frontend/build')
CORS(app) #comment this on deployment
api = Api(app)


@app.route("/")
def hello():
    return send_from_directory(app.static_folder, 'index.html')

@app.route("/find_data", methods = ['POST'])
def FindData():
    person = request.get_json()['person']
    print(person)
    results = {}
    data_finder = DataFinder()


    results['Spokeo'] = list(data_finder.get_spokeo_data(person))
    results['White Pages'] = list(data_finder.get_whitepages_data(person).keys())

    return make_response(jsonify(results), 200)

must be app.py because in the file uwsgi.py you use the instruction: from app import app

Make sure you have created the Unix socket file myproject.sock in the same folder that contains app.py and uwsgi.py. In fact in the file project.ini you are using the option:

socket = myproject.sock

To create this socket and give it the right permission you can use the following Python script:

import socket as s
import pwd
import grp
import os

path = './myproject.sock'

# create the `Unix Domain Socket`
sock = s.socket(s.AF_UNIX)
sock.bind(path)

# set user and group for the Unix Domain Socket created (www is the same user of NGINX)
uid = pwd.getpwnam("www").pw_uid
gid = grp.getgrnam("www").gr_gid

os.chown(path, uid, gid)
os.chmod(path, 0o660)

Save previous program in the folder where you have to create the Unix Domain Socket (see the instruction path = './myproject.sock'). May be it exists other ways to create a Unix Socket Domain file, but I used the previous Python program in my flask/uwsgi application.

I hope that these advises are useful for you.

This answer works as I change the names of files and follow exactly.

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