angularjs - $http.post().then vs $q library? -

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it understanding when $http.post(...).then(...) in angularjs, returns promise. confusing part me $q promise library , if $http.post(...).then(...) creates promise me, $q library necessary?

if dealing respose via $http.post(...).then(...) don't need use $q service directly.

but angular uses $q internaly when calling $http.

also note $q not separate library, module inside angular core.


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