Mod_Proxy - proxy_ajp and proxy_http difference intended?

[NormW]

Greetings All,
Testing the Apache21 CVS using proxy_ajp and proxy_http:
When using proxy_ajp with the following configuration:
        <Proxy balancer://test1>
                BalancerMember  ajp://localhost:9009
        </Proxy>
        <Location /admin>
                ProxyPass balancer://test1
        </Location>
If I send a URL to the Apache of /admin, then '/admin' is forwarded to 
Tomcat and the login page is displayed.

However, when using proxy_http with the following configuration:
        <Proxy balancer://test1>
                BalancerMember http://test.com.au:80
        </Proxy>
        <Location /manuald>
                ProxyPass balancer://test1
        </Location>
If I send a URL to the Apache of /manuald, then only '/' is forwarded to 
the second Apache server in the GET. To get proxy_http to work correctly 
I have change the configuration to:

        <Proxy balancer://test1>
                BalancerMember http://test.com.au:80
        </Proxy>
        <Location /manuald>
                ProxyPass balancer://test1/manuald
        </Location>
Curious if this difference in operation is intended?
Cheers,
Norm