500 for HTTPS

[bzamecnik]

URLs with HTTPS results in a 500 which is not shown as an error on the front-end.

• https://realpython.com -> error
• http://realpython.com -> ok

Same behavior for other sites.

[Johnlock1]

I changed how url is handled in app.py in '/start' route.

    if 'http://' in url[:7] or 'https://' in url[:8]:
        pass
    else:
        url = 'http://' + url