In the Object Data there is an Auto Smooth option which let you select the Phong angle of the mesh. But I think it's only visually, I haven't tried exporting the mesh to see if it retains the settubgs To actually edit the normals you probably need the Blend4Web Add-on pack.
Hello - yes, this looks normal ... but probably not what you want :) To control shading with sharp edges : - You do not need any modifier or an add-on, and you probably don't want to rely on angle-based smoothing either if you need 100% control (sorry for disagreeing with the above suggestions but I thought I'd cut…