On my laptop, with Apache

I have different web apps in various directories on my laptop, that I can start using simple webservers listening on different ports. For example

~/app1/./app.pl
>> listening on http://localhost:3000/

~/app2/./app.pl
>> listening on http://localhost:3001/

~/app3/./app.pl
>> listening on http://localhost:3001/

I want to access the above from my browser like so

http://localhost/app1
http://localhost/app2
http://localhost/app3

Can I do the above with mod_proxy? If so, how?

Update: I must add that I have Googled for mod_proxy, read the tutes on Apache's website, and experimented with the following

uncommented the following in my httpd.conf

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so

added the following in my httpd.conf

<IfModule mod_proxy.c>
    ProxyRequests On
    ProxyPass /app1 http://localhost:3000/
    ProxyPassReverse /app1 http://localhost:3000/
    ProxyPass /app2 http://localhost:3001/
    ProxyPassReverse /app2 http://localhost:3001/
    ProxyPass /app3 http://localhost:3002/
    ProxyPassReverse /app3 http://localhost:3002/
</IfModule>

Yet, I get HTTP 404 when I try to access the above apps.