def guess_scheme(environ):
    if environ.get("HTTPS") in ('yes','on','1'):
        return 'https'
    else:
        return 'http'
Return a guess for whether 'wsgi.url_scheme' should be 'http' or 'https'
dataset/ETHPy150Open CollabQ/CollabQ/vendor/wsgiref/util.py/guess_scheme