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Defaultly, Yaf_Router only have a Yaf_Route_Static as its default route.
And Yaf_Route_Static is designed to handle the 80% requirement.
please *NOTE* that it is unecessary to instance a Yaf_Route_Static, also unecesary to add it into Yaf_Router's route stack, since there is always be one in Yaf_Router's route stack, and always be called at the last time.