problem with urlpatterns in django

why the url pattern like this:

api/actions/info/(?P<user_id>)/(?P<action_id>)/

does开发者_JAVA百科 not recognize this url:

http://address/api/actions/info/3/4/ 

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Because you don't actually match anything within the groups.

Use

^api/actions/info/(?P<user_id>\d+)/(?P<action_id>\d+)/

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You've named your groups, but they don't actually contain anything.

api/actions/info/(?P<user_id>\d+)/(?P<action_id>\d+)/