code: func (r *ssrf) ResolveVar(n *ast.CallExpr, c *gosec.Context) bool {
  	if len(n.Args) > 0 {
  		arg := n.Args[0]
  		if ident, ok := arg.(*ast.Ident); ok {
  			obj := c.Info.ObjectOf(ident)
  			if _, ok := obj.(*types.Var); ok && !gosec.TryResolve(ident, c) {
  				return true
  			}
  		}
  	}
  	return false
  }
docs: // ResolveVar tries to resolve the first argument of a call expression
  // The first argument is the url