your backend code has no any body response. add ResponseBuilder entity to your Response.it should be like this:
return Response.status(Response.Status.OK)// Response.Status.OK: 200
.header("Access-Control-Allow-Origin", "*")
.header("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT")
.entity(userToCreate).build();
from: https://stackoverflow.com/questions/35502237/response-success-undefined-in-angular/35502491#35502491
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