Get IP address on GAE with Flask with ProxyFix

user_136598 0
Viewed 429

I have a Python 3 app on Google App Engine Standard.

I was using request.remote_addr to get users' IP addresses and it was always returning 127.0.0.1.

I then added werkzeug ProxyFix like this:

from werkzeug.middleware.proxy_fix import ProxyFix
app.wsgi_app = ProxyFix(app.wsgi_app)

I'm also using other middleware to enable cloud ndb:

app.wsgi_app = ndb_wsgi_middleware(app.wsgi_app)

Now request.remote_addr always returns 169.254.1.1 which is a link-local IP address.

Is there a way to fix ProxyFix to get Flask to return the correct IP address?

The X-Forwarded-For header does have the right IP address, but I'd like to get this IP address in request.remote_addr.

middleware flask google-app-engine proxy python
3 Answers

It looks like app engine has two proxies. Don't know what the second one is (one is for the load balancer).

The solution is to tell ProxyFix to trust both proxies, and you do that this way:

app.wsgi_app = ProxyFix(app.wsgi_app, x_for=2)
user_1365980

  1. Is it possible request.remote_addr was giving you 127.0.0.1 because you are on your dev environment (LAN)?

  2. This doesn't answer your question - but is there a specific reason why you want to use request.remote_addr instead of X-Forwarded-For?

user_152112030

You can use one of following options, try both of them to see which one works for you:

user_ip = request.headers.getlist("X-Forwarded-For")[0]
user_ip_2 = request.headers['x-appengine-user-ip']
user_98568570
Related