I have some logic in a frontend that routes to different backends based on both the host and the url. Logically it looks like this:

if hdr(host) ends with 'a.domain.com':
    if url starts with '/dir1/':
        use backend domain.com/dir1/
    elif url starts with '/dir2/':
        use backend domain.com/dir2/
    # ... else if ladder repeats on different dirs
elif hdr(host) ends with 'b.domain.com':
    # another else if ladder exactly the same as above
    # ...
# ... else if ladder repeats like this on different domains

Is there a way to group acls to avoid having to repeatedly check the domain acl?

Obviously there needs to be a use backend statement for each possibility, but I don't want to have to check the domain over and over because it's very inefficient.

In other words, I want to avoid this:

use backend domain.com/url1/ if acl-domain.com and acl-url1
use backend domain.com/url2/ if acl-domain.com and acl-url2
use backend domain.com/url3/ if acl-domain.com and acl-url3
# tons more possibilities below

because it has to keep checking acl-domain.com.

This is particularly an issue because I have specific rules for subdomains such as a.domain.com and b.domain.com, but I want to fall back on the most common case of *.domain.com. That means every single rule that uses a specific subdomain must be checked prior to *.domain.com which makes it even more inefficient for the common case.