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A Layer 7 load balancer is more sophisticated and more powerful. It inspects packets, has access to HTTP and HTTPS headers, and (armed with more information) can do a more intelligent job of spreading the load out to the target.

https://aws.amazon.com/blogs/aws/new-aws-application-load-balancer/

I understand the AWS Application Load Balancer has access to the HTTP(S) request headers but I can only see how you can route via the path. Can someone explain how I can route based on the user-agent header. If it's not possible, please suggest an alternative AWS method.

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The host-based routing in ALB allows writing rules that use the host header to route traffic. Now in addition to that, it also supports routing based on standard and custom HTTP headers, methods, the query string and even source IP address. 

For more details, you can refer the following link:

https://aws.amazon.com/blogs/aws/new-advanced-request-routing-for-aws-application-load-balancers/

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