Docker - Bad Gateway when attempting to proxy nginx container to laravel php-fpm container

I'm trying to work out whats causing a 502.

I have a simple application with two containers:

web - running nginx, with a proxy to app: fastcgi_pass app:9000;

app - running php-fpm. I'm not sure how I can pass requests from web but on app/locally if I run php artisan up I get a response of Application is already up.

I can also ping app from web apt-get update && apt-get install iputils-ping -y && ping app

If I attempt to visit artery.local in a browser I can see web in the docker logs write

web | 2021/11/29 21:55:33 [error] 31#31: *9 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 172.18.0.1, server: artery.local, request: "GET /admin/home HTTP/1.1", upstream: "fastcgi://172.18.0.2:9000", host: "artery.local"

Please can someone help me shed some light on this. I'm not sure what I can do to test that app/php-fpm is listening correctly to requests forwared by web/nginx.

docker-compose.yml

version: '3'
services:

  # The app
  app:
    build:
      context: ./
      dockerfile: ./app-dev.dockerfile
    working_dir: /var/www
    container_name: app
    volumes:
      - ../:/var/www
#    ports:
#     - 9000:9000
    environment:
      - COMPOSER_MEMORY_LIMIT=-1
    networks:
      - app-network

  # A Web Server
  web:
    build:
      context: ./
      dockerfile: ./web.dockerfile
    container_name: web
    working_dir: /var/www
    volumes:
      - ../:/var/www
    ports:
      - 80:80
    networks:
      - app-network

#Docker Networks
networks:
  app-network:
    driver: bridge

app-dev.dockerfile

FROM php:7.4-fpm

RUN set -eux; \
    apt-get update; \
    apt-get upgrade -y; \
    apt-get install -y --no-install-recommends \
            curl \
            libmemcached-dev \
            libz-dev \
            libpq-dev \
            libjpeg-dev \
            libpng-dev \
            libfreetype6-dev \
            libssl-dev \
            libwebp-dev \
            libmcrypt-dev \
            libonig-dev; \
    rm -rf /var/lib/apt/lists/*

RUN apt-get update && apt-get install -y zlib1g-dev libicu-dev g++ libgmp-dev libpng-dev pdftk graphviz
RUN docker-php-ext-install pcntl
RUN docker-php-ext-install sockets
RUN apt-get install git -y
RUN apt-get install libpcre++-dev -y
RUN pecl install oauth
RUN docker-php-ext-enable oauth

#mysql & gd 
RUN set -eux; \
    # Install the PHP pdo_mysql extention
    docker-php-ext-install pdo_mysql; \
    # Install the PHP gd library
    docker-php-ext-configure gd \
            --prefix=/usr \
            --with-jpeg \
            --with-webp \
            --with-freetype; \
    docker-php-ext-install gd; \
    php -r 'var_dump(gd_info());'

RUN apt-get update \
     && apt-get install -y libzip-dev \
     && docker-php-ext-install zip

# Curl
RUN apt-get install libcurl4-gnutls-dev -y
RUN apt-get update && apt-get install -y libmagickwand-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN printf "\n" | pecl install imagick
RUN docker-php-ext-enable imagick
RUN pear install PHP_CodeSniffer

# PHP REDIS EXTENSION
RUN printf "\n" | pecl install -o -f redis \
    &&  rm -rf /tmp/pear \
    &&  docker-php-ext-enable redis

# Install XDebug
RUN pecl install xdebug && docker-php-ext-enable xdebug
COPY ./xdebug.ini /usr/local/etc/php/conf.d/xdebug.ini

COPY laravel.ini /etc/nginx/conf.d/laravel.conf
COPY ./xlaravel.pool.conf /etc/nginx/conf.d/laravel-pool.conf

COPY laravel.ini /usr/local/etc/php/conf.d
COPY ./xlaravel.pool.conf /usr/local/etc/php-fpm.d/

RUN apt-get update && apt-get install iputils-ping -y

# get composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

EXPOSE 9000
CMD ["php-fpm"]

web.dockerfile

FROM nginx:latest

ADD vhost.conf /etc/nginx/conf.d/default.conf

# forward request and error logs to docker log collector
RUN ln -sf /dev/stdout /var/log/nginx/access.log \
    && ln -sf /dev/stderr /var/log/nginx/error.log

laravel.pool.conf

user = www-data
group = www-data
listen = 0.0.0.0:9000
pm = dynamic
pm.max_children = 20
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
catch_workers_output = yes
request_terminate_timeout = 600

vhost.conf loaded from web.dockerfile

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

    server_name artery.local;

    root /var/www/public;

    # avoid 413 errors when uploading files up to 5M in size
    client_max_body_size 10M;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    index index.html index.htm index.php;

    charset utf-8;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    access_log /var/log/nginx/access.log;
    error_log  /var/log/nginx/error.log;

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass app:9000;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_read_timeout 600;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
}