AWS ELB/ALB http/2 pass thru to EC2 instance via http/2 (not http/1.1)

Question

AWS ELB/ALB now supports HTTP/2.

According to the documentation ( https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-listeners.html ):

Application Load Balancers provide native support for HTTP/2 with HTTPS listeners. You can send up to 128 requests in parallel using one HTTP/2 connection. The load balancer converts these to individual HTTP/1.1 requests and distributes them across the healthy targets in the target group.

My target is an EC2 instance running Apache with HTTP/2 support. Is it possible to have the ALB connect to the target (EC2 instance) via HTTP/2 and avoid having ALB <--> ec2 connections be via HTTP/1.1?

I did not see any way to do this in the console or documentation.

Answer 1

No, this isn't possible.

ALB always converts the requests to HTTP/1.1 and this is not a configurable option.

Answer 2

Yes, it is possible, configure the target group to use http2 in the basic config section as shown below.