How Can I Fix HTTP FileServer\'s Incorrect MIME Type Responses?

HTTP FileServer MIME Type Mismatch

When using http.FileServer to serve files with specific MIME types, a common issue arises when the server responds with an incorrect MIME type, such as "text/html" instead of the desired "audio/mpeg" for MP3 files.

To resolve this issue, we need to delve into the implementation of http.FileServer. This middleware simply retrieves a file from the specified directory and returns it as an HTTP response. However, it does not have explicit control over the MIME type assigned to the response.

The solution lies in modifying the request handling pattern for http.FileServer. By adding a trailing slash to the pattern, like this:

http.Handle("/media/", http.StripPrefix("/media/", fs))

We essentially create a rooted subtree handler. According to the documentation of net/http.ServeMux, longer patterns take precedence over shorter ones. By adding the trailing slash, we ensure that this handler will be called specifically for requests within the "/media/" subtree. This allows us to serve the MP3 files with their correct MIME type.

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