Using Traefik 2.0 with docker for a GRPC application

Traefik Traefik v2
1

I am switching from Nginx to Traefik 2.0 now.
The nginx.conf that i was using looks somewhat like this:

worker_processes 1;

events { worker_connections 1024; }

http {

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

        server_name localhost;

        # Global http redirect to https
        return 301 https://$host$request_uri;
    }


    # HTTPS server
    server {
        listen 443 ssl http2;
        listen [::]:443 ssl http2;    

        ssl_certificate /etc/nginx/certs/myapp.crt;
        ssl_certificate_key /etc/nginx/certs/myapp.key;

        server_name myapp.com myui localhost;

        location /api/ {

                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass https://myapp.com:55555/api/;

                client_max_body_size 500G;

                proxy_connect_timeout       300;
                proxy_send_timeout          300;
                proxy_read_timeout         3600;
                send_timeout                300;

        }

        location /Myapp {
                grpc_pass grpcs://myapp.com:55555;
                client_max_body_size 500G;
                grpc_read_timeout 1d;
                grpc_send_timeout 1d;
                client_body_timeout 1d;
                grpc_buffer_size 500m;
                proxy_connect_timeout       300;
                proxy_send_timeout          300;
                proxy_read_timeout         3600;
                send_timeout                300;
        }

        location / {

                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;

                proxy_pass http://myui:80/;

                client_max_body_size 500G;

                proxy_connect_timeout       300;
                proxy_send_timeout          300;
                proxy_read_timeout         3600;
                send_timeout                300;
        }

        location ~ /\.ht {
                deny all;
        }
    }

}

I almost configured it for Traefik. As of now, i am using a docker-compose like this:

version: '3.2'
services:
  myapp.com:
    image: myapp:master
    restart: always
    labels:
      - traefik.enable=true
      - traefik.http.middlewares.myapp_https.redirectscheme.scheme=https
      - traefik.http.routers.myapp.rule=PathPrefix(`/api/`)
      - traefik.http.routers.myapp.service=myapp@file
      - traefik.http.routers.myapp.entrypoints=insecure
      - traefik.http.routers.myapp.middlewares=myapp_https@docker
      - traefik.http.routers.myapp_https.rule=PathPrefix(`/api/`)
      - traefik.http.routers.myapp_https.service=myapp@file
      - traefik.http.routers.myapp_https.entrypoints=secure
      - traefik.http.routers.myapp_https.tls=true
  myui:
    image: myui:latest
    restart: always
    ports:
    - 90:80  
    labels:
      - traefik.enable=true
      - traefik.http.middlewares.myui_https.redirectscheme.scheme=https
      - traefik.http.routers.myui.rule=Path(`/`)
      - traefik.http.routers.myui.service=myui@file
      - traefik.http.routers.myui.entrypoints=insecure
      - traefik.http.routers.myui.middlewares=myui_https@docker
      - traefik.http.routers.myui_https.rule=Path(`/`)
      - traefik.http.routers.myui_https.tls=true
      - traefik.http.routers.myui_https.service=myui@file
      - traefik.http.routers.myui_https.entrypoints=secure

  proxy:
    image: traefik:v2.0 # The official v2.0 Traefik docker image
    command:
      - --api.insecure=true # Enable the web UI 
      - --log.level=DEBUG
      - --serverstransport.insecureskipverify=true
      - --entrypoints.insecure.address=:80
      - --entrypoints.secure.address=:443
      - --providers.docker=true
      - --providers.docker.network=traefik-network
      - --providers.docker.exposedByDefault=false
      - --providers.file.directory=/etc/traefik/configuration/
      - --providers.file.watch=true
    ports:
    - 80:80     # The HTTP port
    - 443:443   # The HTTPS port
    - 8080:8080 # The traefik Web UI
    volumes:
    - '/var/run/docker.sock:/var/run/docker.sock'   # So that Traefik can listen to the Docker events
    - './traefik:/etc/traefik/configuration'

networks: 
  default: 
    external:
      name: "traefik-network"  #The same network defined in Docker provider config

The traefik configuration file with the support of file provider looks like this:

tls:
  certificates:
    - certFile: /etc/traefik/configuration/certs/myapp.crt
      keyFile: /etc/traefik/configuration/certs/myapp.key

http:
  services:
    myapp:
      loadBalancer:
        servers:
          - url: "https://myapp.com:55555/"
    myui:
      loadBalancer:
        servers:
          - url: "http://myui:80/"

I configured everything expect the Grpc section.
I am confused where to add that configuration - as labels, or in the conf file?
The grpc example in the documentation says that we should use h2c scheme for grpc.
Does that mean grpcs://myapp.com:55555 in my nginx config will change to h2c://myapp.com:55555 in traefik?
Can someone help me to configure this?

Also, suggestions to improve the current configuration are most welcome!