Docker Compose with NGINX proxy pass thru not working

Following is my Docker Compose file & NGINX conf file.

The application seems to work and NGINX is also up, but the proxy_pass setting doesn’t seem to work properly.

File
docker-compose.yaml


networks:
  webapp:

services:
 
  web:
    image: nginx
    volumes:
      - ./data/ntemplates:/etc/nginx/templates
      - ./webapp.conf:/etc/nginx/conf.d/webapp.conf
    ports:
      - "8080:80"
    networks:
      - webapp

  pyweb:
    build: .
    ports:
      - "5000:5000"
    networks:
      - webapp

  redis:
    image: "redis:alpine"
    networks:
      - webapp

File webapp.conf

server { 
    listen       80;
    listen  [::]:80;
    server_name  localhost;

    location / {
       proxy_pass "http://pyweb_1:5000/";
    }

    #error_page  404              /404.html;
    error_page   500 502 503 504  /50x.html;

}

Service pyweb is working if properly if directly accessed by http://pyweb_1:5000

I created this app based on docker getting started page
For completeness below are other files and seems to be working just fine.

File Dockerfile

FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
COPY . .
CMD ["flask", "run"]FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
COPY . .
CMD ["flask", "run"]

File requirement.txt

flask
redis

File app.py

import time

import redis
from flask import Flask

app = Flask(__name__)
cache = redis.Redis(host='redis', port=6379)

def get_hit_count():
    retries = 5
    while True:
        try:
            return cache.incr('hits')
        except redis.exceptions.ConnectionError as exc:
            if retries == 0:
                raise exc
            retries -= 1
            time.sleep(0.5)

@app.route('/')
def hello():
    count = get_hit_count()
    return 'Hello World! I have been seen {} times.n'.format(count)

Source: Docker Questions