Redirect HTTP to HTTPS on Flask+Heroku

1) Do "pip install flask-sslify"

(github is here: https://github.com/kennethreitz/flask-sslify)

2) Include the following lines:

from flask_sslify import SSLify
if 'DYNO' in os.environ: # only trigger SSLify if the app is running on Heroku
    sslify = SSLify(app)

On Heroku, SSL (https) is terminated before it reaches your application, so you app never actually sees SSL traffic. To check whether a request was made with https, you instead have to inspect the x-forwarded-proto header. More info here: How to make python on Heroku https only?

UPDATE: For your use, you should just check request.url for "myapp.herokuapp.com/checkout/"; and verify that the header is "https"

I tried SSLify, url_for _scheme, and setting a PREFERRED_URL_SCHEME; however none worked out, at the release level at least.. (worked fine locally) Then I thought;

@app.before_request
def beforeRequest():
    if not request.url.startswith('https'):
        return redirect(request.url.replace('http', 'https', 1))

This is essentially another way to get it done without any configurations, or extensions.