Application Load Balancer (ALB)
An ALB functions at the application layer (the seventh layer of the OSI model).
After the load balancer receives a request, it evaluates the listener rules in priority order to determine which rule to apply, and then selects a target from the target group for the rule action.
Host conditions
You can use host conditions to define rules that route requests based on the host name in the host header (also known as host-based routing).
This enables you to support multiple subdomains and different top-level domains using a single load balancer.
Example hostnames
example.comtest.example.comhello.example.com
Path conditions
You can use path conditions to define rules that route requests based on the URL in the request (also known as path-based routing).
The path pattern is applied only to the path of the URL, not to its query parameters.
Example HTTP path patterns
/img/*/img/*/pics
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