How to configure MIME types within web.config.

mime_type_configuration.xml

<?xml version="1.0"?>
<configuration>
  <system.webServer>
    <staticContent>
      <mimeMap fileExtension=".vtt" mimeType="text/vtt" />
      <mimeMap fileExtension=".srt" mimeType="text/srt" />
      <mimeMap fileExtension=".aac" mimeType="audio/aac" />
      <mimeMap fileExtension=".oga" mimeType="audio/ogg" />
      <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
      <mimeMap fileExtension=".webm" mimeType="video/webm" />
      <mimeMap fileExtension=".ogv" mimeType="video/ogv" />
      <mimeMap fileExtension=".ogg" mimeType="video/ogg" />
      <mimeMap fileExtension=".m4a" mimeType="video/mp4" />
    </staticContent>
  </system.webServer>
</configuration>