How to Fix the \"Could Not Guess Mimetype\" Error in App Engine?

Troubleshooting "Could Not Guess Mimetype" Error in App Engine

When deploying an application to Google App Engine, users may encounter the error "Could not guess mimetype" for specific file types, such as .otf files. This error occurs when App Engine is unable to automatically determine the appropriate MIME type for the file.

To resolve this issue and ensure that App Engine serves the file with the correct MIME type, it is necessary to provide a hint to the App Engine runtime. Instead of relying on the "http_headers" directive, use the "mime_type" directive in your app.yaml configuration file.

For example, to specify the correct MIME type for .otf files, modify the configuration as follows:

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

By defining the MIME type explicitly, App Engine will use this information to serve the file with the correct MIME type. This should resolve the "Could not guess mimetype" error and ensure that the file is served correctly in your application.

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