gazebo world and models in gzweb

edit

When i launch the gazebo world with robot in xacro format in gzweb i'm only able to view the world file which was present in sdf format but not the robot itself. Any suggestion how to fix this? Steps i did:

roslaunch bini_simulation bini_world.launch

npm start

But after i open the web url i only see the world without any robots models which is present in xacro file.

And also the color of world is not comming as shown in above scrrenshot.