First of all, check the following image:
The left part represents jquery´s POST:
($.post("localhost:65066/Store/Browse2?QualificatifsIDs=483", { responseType: "json" })
And the right is angular´s POST:
($http.post("localhost:65066/Store/Browse2?QualificatifsIDs=483", { responseType: "json" }))
The left result is the expected one. Why is there a difference?