[squid-users] Prepending a string to cache_peer username

[Charlie Orford]

Annoyingly, one of our upstream cache_peers requires a fixed string to 
be prepended to client usernames.

I'm aware the login= option for cache_peer allows substituting * with 
client provided username and appending a fixed string to this.

Is there a way to achieve something similar if we need to prepend rather 
than append a string (perhaps a clever ACL/external_auth trick we could 
use to modify client usernames destined for this peer)?

Thanks for any suggestions.

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