Add StaticFileHandler with SVG mime type
class HTTP::StaticFileHandler
  private def mime_type(path)
    case File.extname(path)
    when ".txt"          then "text/plain"
    when ".htm", ".html" then "text/html"
    when ".css"          then "text/css"
    when ".js"           then "application/javascript"
    when ".svg"          then "image/svg+xml"
    when ".svgz"         then "image/svg+xml"
    else                      "application/octet-stream"
    end
  end
end