proxy restrictions/security config ?

Hi

I'm new to Apache configurations. Could you please suggest how I might
achieve the below proxy restrictions within Apache 2.2, thanks.

I need the apache forwarding proxy's restrictions to only allow :
- Any client computers to be able to access web server "srv-a".
- A client computer "client-b" to be able to access any web servers.

As such, the proxy's restrictions need to prevent:
- Any other client computers (ie other than "client-b") from accessing
other web servers (ie other than "srv-a").

I've tried the below and it seems to work, but please do suggest any
better configurations, thanks.

ProxyRequests On
ProxyVia Off


Order deny,allow
Deny from all
Allow from all



Order deny,allow
Deny from all
Allow from client-b


Thanks,
Declan




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