I was tring to configure and setup the developer environment of a single instance of the WhatsApp Business API.I had finished #Step 5 https://developers.facebook.com/docs/whatsapp/installation/dev-single-instance#step-5--verify-containers-are-running and the docker is running. enter image description here

Whenever I try to call https://localhost:9090 in browser but the error is "This site can’t be reached". then i used the command docker-compose logs,the error is MySQL is not up yet - sleeping and getaddrinfo for host "db" port 3306: Name or service not known enter image description here Here is db.env code

WA_DB_ENGINE=MYSQL WA_DB_HOSTNAME=db WA_DB_PORT=3306 WA_DB_USERNAME=root WA_DB_PASSWORD=testpass WA_DB_CONNECTION_IDLE_TIMEOUT=180000 

So anyone have idea please, thanks a lot.