def METHOD_NAME(self, path):
    """Guess the type of a file.
    Argument is a PATH (a filename).
    Return value is a string of the form type/subtype,
    usable for a MIME Content-type header.
    The default implementation looks the file's extension
    up in the table self.extensions_map, using application/octet-stream
    as a default; however it would be permissible (if
    slow) to look inside the data to make a better guess.
    """
    base, ext = posixpath.splitext(path)
    if ext in self.extensions_map:
        return self.extensions_map[ext]
    ext = ext.lower()
    if ext in self.extensions_map:
        return self.extensions_map[ext]
    else:
        return self.extensions_map['']