[Solved] Can’t serve external CSS File in Go webapp

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You have to set the Content-Type header in the response correctly. Without the content type, most browsers will not execute the css. Something like the following should work, but this is essentially just a sketch:

 http.HandleFunc("/static/",func(wr http.ResponseWriter,req *http.Request) {
    // Determine mime type based on the URL
    if req.URL.Path.HasSuffix(".css") {
      wr.Header().Set("Content-Type","text/css")
    } 
    http.StripPrefix("/static/", fs)).ServeHTTP(wr,req)
 })

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solved Can’t serve external CSS File in Go webapp