MIME type glsl

Good Morning (here),

I changed the web-project-templates-master\vue-vtkjs-pvw-template example. The only file changed is \server\vtkpython\vtk_protocol.py. I send below the vtk_protocol.py file and a .mhd image to test.
The idea is to show and interact with an image .mhd instead of a cone.
The image appears in the OpenGL image in the server but not in the browser (client).

Changed Example

Can someone please give some guide lines to go further?

Thanks,

Luís Gonçalves