How to Fix the \'Could Not Guess Mimetype\' Issue for .otf Fonts in App Engine?

"Could Not Guess Mimetype" Issue in App Engine

Developers often encounter an issue where App Engine overrides the MIME type of certain files, such as .otf fonts, defaulting to "application/octet-stream." This article addresses this problem and explains how to specify the correct MIME type for your files.

In your given configuration file, you have defined static file handlers for various file types, including fonts. However, the handler for .otf files originally used "http_headers" to set the MIME type, which is incorrect.

To resolve this, you need to use the "mime_type" key instead:

<code class="yaml"> - url: /home/font/(.*\.otf)
   static_files: home/font/
   upload: home/font/(.*\.otf)
   mime_type: application/x-font-otf</code>

By specifying the MIME type explicitly using "mime_type," you are instructing App Engine to use the correct MIME type for .otf files, which should prevent the default override.

It's important to ensure that the MIME type you specify is accurate for the file type in question. If you're unsure, you can refer to standard MIME type definitions or consult relevant documentation for your specific file type.

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