How Can I Correctly Serve Files with http.FileServer and Avoid Incorrect Mime Types?

Modifying Mime Types Returned by http.FileServer

The http.FileServer package in Go provides a convenient way to serve static files. However, sometimes, the default mime types returned by FileServer may not be accurate. For instance, if you have a directory of mp3 files, FileServer might serve them with a Content-Type header of text/html, which would cause problems with media players. This article addresses the common issue of FileServer serving incorrect mime types and provides a solution.

The code provided in the question sets up FileServer to serve a directory of mp3 files at the /media endpoint. The issue arose because the request for the mp3 file did not match the FileServer's pattern. The pattern /media was missing a trailing slash, which caused the FileServer handler to be bypassed.

To fix this issue, modify the pattern to include a trailing slash:

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

By adding the trailing slash, we create a rooted subtree handler that matches all paths starting with "/media/". This ensures that FileServer will handle requests for mp3 files and serve them with the correct mime type.

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