如果在項目文件夾下創建一個文件夾utils，里面存自己定義的中間件。

要是出現這種問題

django.core.exceptions.ImproperlyConfigured: 'utils.md.ExampleMiddleware' isn't a subclass of AppConfig.

解決方法：
在 settings.py 里

# 將自定義的中間件寫在這里MIDDLEWARE = ['django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.common.CommonMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware','utils.md.ExampleMiddleware',  # 寫這里
]

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