Cannot load png

[matthew-cheney]

After cloning your repository and running main.py (& python3 main.py), the server starts and loads the homepage. However, it does not load space-background.png, and gives the error 'TypeError: encoding without a string argument.'

More details in attached png.

[rfuehrer]

No need to convert a byte object to byte. You can fix it immediately by changing server.py line 49 from

            return bytes(content, 'UTF-8')

to

        if isinstance(content, bytes):
            return content
        else:
            return bytes(content, 'UTF-8')