AJP12 or AJP13?

[wen]

Hi,
I am new to tomcat. I am not sure which protocol should be set in my server.xml,
AJP12 or AJP13?  How to know which protocol is supported in my box? 
My platform is GNU/Linux Debian(unstable) and
apache 1.3.19
tomcat 3.2.2
libapache-mod-j k3.2.2

Thanks so much in advance.

Regards,

--Wen
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