'"Invalid Host header" error when access AWS ECS through load balancer

I used AWS ECS to deploy my docker app and after successful deployment I can access to the application with public IP address given without any problem.

But when I created an AWS load balancer for ECS and try to access with load balancer's DNS name I'm getting Invalid Host header.

What is the reason for this ?

My running docker containers,

nginx at port 80
frontend at port 3000
backend at port 5000

docker amazon-ecs aws-application-load-balancer

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'"Invalid Host header" error when access AWS ECS through load balancer

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