Laravel5.7 mime type

Use mime type to specify the extension of the image in laravel.

A full listing of MIME types and their corresponding extensions may be found at the following location:
https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types

I wonder if this match??

custom request
ImageRequest.php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class ImageRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return false;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'image' => 'image|mimes:jpg,jpeg,gif,png',
        ];
    }
    public function messages()
    {
        return [
            'image.required' => '画像以外のファイルが指定されています。画像ファイル(png/jpg/jpeg/gif)を指定して下さい',
        ];
    }
}