Remote IP on Heroku

gistfile1.rb

def remote_ip
  if forwarded = request.env["HTTP_X_FORWARDED_FOR"]
    forwarded.split(",").first
  elsif addr = request.env["REMOTE_ADDR"]
    addr
  end
end

request.env["HTTP_X_FORWARDED_FOR"].try(:split, ',').try(:first) || request.env["REMOTE_ADDR"]

Shouldn't it be .last??

curl -H 'X-Forwarded-For: x.y.z' http://httpbin.org/ip
#=> { "origin": "x.y.z, 73.25.72.189" }

request.env["HTTP_X_FORWARDED_FOR"].try(:split, ',').try(:last) || request.env["REMOTE_ADDR"]

For Rails > 2.3.2, you should be able to use request.remote_ip (Docs)

@philtr @bnorton if you are using heroku + rails + cloudflare, then user_ip_addr = request.env["HTTP_X_FORWARDED_FOR"].try(:split, ',').try(:first) || request.env["REMOTE_ADDR"] is the correct solution

@zackster why not request.remote_ip on heroku + rails + cloudflare?

@jrochkind my post was 5 years ago.. yours is probably the correct answer for 2022. :-)