message: Fix bug where probe URLs may lack `/`
  Fixes
diff: @@ -86,7 +86,11 @@ const flatteners = {
  }
  if (cmd.path) {
  + if (cmd.path.startsWith('/')) {
  c += cmd.path;
  + } else {
  + c += `/${cmd.path}`;
  + }
  }
  return c;
  },
  