I think you got me wrong. Glass is a dielectric and all dielectrics have reflection not colored. If a shader called Glass, it should behave like glass. Of course, glass can have a colored reflection if it's not a usual silicon glass, but have some metals mixed in it. There's is nothing to do with volume absorption.
The default glass shader should have the white reflection and colored refraction. If we'd like to have a colored reflection, then we mix refraction node with glossy node and so on.

Glass typically has white reflection and refraction, the color comes from absorption. We provide a color for artistic control. The improvement here would be to add absorption support into the glass shader, or provide support for thin surfaces that compute two refractions at once.

Oh, i got your point, thank you.

Try Principled with Transmission = 1.

Hi.
Here the explanation by Pascal about this in Principled shader:
https://blenderartists.org/forum/showthread.php?403342-Cycles-Disney-Brdf&p=3103607&viewfull=1#post3103607

Thanks to Brecht, there is a quite obvious solution. Use Glass BSDF and plug volume absorption shader in the volume input. We get correct reflection + correct colored absorption in the glass!
And yes, i mentioned that we can use Principled BSDF for colored glass, but it's a bit slower and doesn't provide physically absorption all alone.