Snippets Tutorial on DRF -- Responding to 404 Error

[Djangonaut]

I have followed the snippets tutorial to the end and have a question regarding responding to a 404 Error for a snippet or any other item that is not found.  Please see attached image.  Is there a way to disable the `DELETE` operation and `PUT` form when an error is raised? Where in the code can I do this?  Thank you so much!