Get client's IP address in Sinatra?

Question

This is a really simple question, but I cannot find any mention of this, anywhere..

How do I get the client's IP address from in Sinatra?

get '/' do
    "Your IP address is #{....}"
end

Err, oh, it's in `@env['REMOTE_ADDR']` - I had checked the `@env.inspect` output by searching for "127.0.0.1", but it was showing the IPv6 `::1` address so I missed it... Anyone feel free to post that so I can accept it without the 48-hour wait.. (free rep! :P) — dbr, Aug 23 '09 at 19:27

score 74 · Accepted Answer · edited Jun 29 '16 at 17:09

74

Sinatra provides a request object, which is the interface to the client request data that you should be using.

Using request.ip is the preferred method to find the client's IP address:

get '/' do
  "Your IP address is #{request.ip}"
end

edited Jun 29 '16 at 17:09

Matteo Ragni

answered Sep 16 '11 at 17:27

user229044

3

It should be noted that `Request#ip` method comes from Rack, not from Sinatra. – skalee Jan 22 '18 at 08:38

Brian Gianforcaro · Answer 2 · 2009-08-23T19:39:51.577

18

I was coming to post the answer anyway.. so:

get '/' do
"Your IP address is #{ @env['REMOTE_ADDR'] }"
end

Sinatra uses the Rack::Request API, so you can use a lot of things available in it.
Also a link to the Sinatra doc's.

edited Aug 23 '09 at 19:39

answered Aug 23 '09 at 19:33

Brian Gianforcaro

2

Hm, the Rack::Request API mentions an `ip` method, which handles the `HTTP_X_FORWARDED_FOR` as well, is there a way to call this from Sinatra? – dbr Aug 23 '09 at 20:38
1

you should be able to just do #{ @env['HTTP_X_FORWARDED_FOR'] } I have never tested this though, so I'm not positive. – Brian Gianforcaro Aug 23 '09 at 20:57
7

you can do request.ip directly, as well. get "/" do; "your IP: #{request.ip}"; end – bantic Aug 10 '10 at 15:18
2

see: https://github.com/chneukirchen/rack/blob/master/lib/rack/request.rb#L315 ... very risky approach here – Sam Saffron Jun 28 '12 at 06:19

2 Answers2