Flask request.remote_addr is wrong on webfaction and not showing real user IP

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If there is a proxy in front of Flask, then something like this will get the real IP in Flask:

if request.headers.getlist("X-Forwarded-For"):
   ip = request.headers.getlist("X-Forwarded-For")[0]
else:
   ip = request.remote_addr

Update: Very good point mentioned by Eli in his comment. There could be some security issues if you just simply use this. Read Eli’s post to get more details.

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