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Get Client IP Behind Proxy

Author:
brianjaystanley
Posted:
October 21, 2011
Language:
Python
Version:
Not specified
Score:
2 (after 2 ratings)

If your application server is behind a proxy, request.META["REMOTE_ADDR"] will likely return the proxy server's IP, not the client's IP. The proxy server will usually provide the client's IP in the HTTP_X_FORWARDED_FOR header. This util function checks both headers. I use it behind Amazon's Elastic Load Balancer (ELB).

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def get_ip(request):
    """Returns the IP of the request, accounting for the possibility of being
    behind a proxy.
    """
    ip = request.META.get("HTTP_X_FORWARDED_FOR", None)
    if ip:
        # X_FORWARDED_FOR returns client1, proxy1, proxy2,...
        ip = ip.split(", ")[0]
    else:
        ip = request.META.get("REMOTE_ADDR", "")
    return ip

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