Using NGINX as API Gateway, Frontend Not loading

Hello everyone,

I am using NGINX as an API gateway & currently have 2 Meteor apps, which I want to run. I need to run as per Micro Service Architecture,

Here are the configuration files I have used

worker_processes 4;

events {
    worker_connections 1024;
}


http{
    server{
        listen 3003;

        location / {
            proxy_pass http://main_web:3000;
            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;
        }

        location ~ ^/group {
            rewrite ^/group/(.*) /$1 break;
            proxy_pass http://group:3001;
            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;
        }

    }
}
version: '3'
services:
  
    
  main_web:
    container_name: main_web
    image: username/parent_web:1.0
    environment:
      MONGO_URL: ${MONGO_URL}
    ports:
      - "3000:3000"
    restart: always
    

  group:
    container_name: group
    image: user_name/child_group:0.2
    environment:
      MONGO_URL: ${MONGO_URL}
    ports:
      - "3001:3001"
    restart: always
    depends_on:
      - "main_web"

  nginx-proxy:
    build:
      dockerfile: Dockerfile
      context: ./proxy
    depends_on:
      - main_web
      - group
    ports:
      - "3003:3003"
 

DockerFile for NGINX

FROM nginx

RUN rm /etc/nginx/nginx.conf

COPY nginx.conf /etc/nginx/nginx.conf

With this config, I am able to call the backend APIs for Group (Micro Service) Successfully but when I tries to load the frontend part using HTTP://localhost:3003/groups then its not working, I am getting the blank page with an error 404, scripts not loaded

I believe the issue is related with ROOT_URL but I have tried to change that as well. Still no luck, Please let me know if anyone faced similar thing or knows how to fix the same

Thanks