Beanstalk: Routing to the _same_ instance based on url path

Question

I am currently using Beanstalk with an Application Load Balancer. I want to achieve the following load balancing rule:
1. Given websocket requests a) `myapi.com?param=1` b) `myapi.com?param=2` c) `myapi.com?param=1`
2. I want all the requests with the same `param` to route to the same ec2 instance. (In the example above a & c would go to the same ec2 instance)

How would you achieve this? 
1. I don't think I can use. Application Load Balancer, as it routes to target groups, and afaik Beanstalk only has one target group
2. I can't quite use session affinity, as it's about routing the same `client` to the same machine, whereas this would route multiple different clients to the same machine

Sivaraman Selvam · Answer

Hello,

This thread explains a similar use case that you want to achieve with Application load balancer and AWS beanstalk application. https://stackoverflow.com/questions/41807676/load-balancing-across-different-elastic-beanstalk-applications

Also refer this blog posts to share ALB across different Beanstalk application and environment: https://aws.amazon.com/blogs/containers/amazon-elastic-beanstalk-introduces-support-shared-load-balancers/

ALB supports advance routing methods like host, headers, path, query, source IP based routing.

References:
1. https://repost.aws/knowledge-center/elb-achieve-path-based-routing-alb
2. https://exampleloadbalancer.com/advanced_request_routing_demo.html

Hope this helps

Beanstalk: Routing to the _same_ instance based on url path

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