code: async def list_keys(request: web.Request) -> web.Response:
      
      return web.json_response(
          {'public_keys': [{'key_md5': details[0], 'key': details[1]}
                           for details in get_keys()]},
          status=200)
docs: List keys in the authorized_keys file.
  
      GET /server/ssh_keys
      -> 200 OK {"public_keys": [{"key_md5": md5 hex digest, "key": key string}]}
  
      (or 403 if not from the link-local connection)