The controller is as follows. View a search box and submit it to the search method of the controller below:

    public function search(Request $request)
    {
        $keywords= $request->input('keywords');
        $articles = Article::search($keywords)->get();
        return view('pages.search-list', compact('articles'));
    }

The result can be obtained normally using the get method, but the following error occurs when using the post method:

Want to know why.