make RP aware of running behind ssl terminating front end proxy #118
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The exisiting Flask RP example application was not recoginizing X-Forwarded-* headers properly. For example if you run the example application behind a Treafik Proxy which is terminating TLS, the flask-rp application publishing http:// urls when registering itself at the Flaks-OP Provider instance.
This PR make use of the ProxyFix method to make the flask application acknownledge the forwarded headers properly.
Refer: https://werkzeug.palletsprojects.com/en/stable/middleware/proxy_fix/