title: Some static files can't be loaded because it is blocked by CORS policy (Django) even it is configured based on Django documentation
body: <p>I faced an issue with a CORS policy and cannot see what is wrong.</p>
  <p>I use Django framework and my static files are hosted in Azure Blob</p>
  <p>So I am getting errors for these files and it says tuat Access-Control-Allow-Origin is not present:
  <a href="https://i.stack.imgur.com/oFTH2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oFTH2.png" alt="enter image description here" /></a>
  <a href="https://i.stack.imgur.com/HOCD5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HOCD5.png" alt="enter image description here" /></a></p>
  <p>What is strange that other files from the same host are loaded..
  <a href="https://i.stack.imgur.com/HwlNa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HwlNa.png" alt="enter image description here" /></a></p>
  <p>CORS settings looks like this:</p>
  <pre><code>ALLOWED_HOSTS = ['https://support.mdesk.lt', 'https://suppaccountstorage.blob.core.windows.net']
  CORS_ORIGIN_ALLOW_ALL = False
  
  CORS_ORIGIN_WHITELIST = (
      'https://support.mdesk.lt',
      'https://suppaccountstorage.blob.core.windows.net',
  )
  
  CSRF_TRUSTED_ORIGINS = ['https://support.mdesk.lt']
  
  INSTALLED_APPS = [
      'corsheaders',
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'django.contrib.sites',
      'django.contrib.humanize',
      'bootstrap4form',
      'supportSystem',
      'storages'
  ]
  SITE_ID = 1
  
  MIDDLEWARE = [
      'corsheaders.middleware.CorsMiddleware',
      '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',
  ]
  
  </code></pre>
  <p>Wham am I doing wrong?</p>