Do I need to add "www" as an alias for subdomains?

Hi:
I've just set up a subdomain that's hosted on a different server, using a A record in WHM. One problem I've noticed is that if I type:

http://test.domain.com/dir

instead of:

http://test.domain.com/dir/ (trailing slash)

I get a page not found. My guess is without the slash, it tries to go to http://www.test.domain.com

How would I solve this problem? Add "www.test" as a A record as well to redirect to the actual IP?

Thanks,

 

 

 

 

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