Faraday middleware know when something was redirected - ruby

Question

I'm using the following code to make a request and follow redirects:
require 'faraday'
require 'faraday_middleware'
conn = Faraday.new() do |f|
f.use FaradayMiddleware::FollowRedirects, limit: 5
f.adapter Faraday.default_adapter
end
resp = conn.get('http://www.example.com/redirect')
resp.status
This code outputs 200 because it followed the redirect, which is great. But is there anyway to know if a redirect existed or not? something like resp.redirected which is set to true if a redirect was followed or false if no redirect was followed?
I didn't see anything obvious in the FollowRedirects code.
Will I need to write my own custom middleware if I want to know this? Does anyone know of middleware out there that might do this already?

Answer 1

I found a solution. You can pass a callback to FaradayMiddleware::FollowRedirects. The callback should live in a hash that the FollowRedirects takes a second parameter. Since we have to use the use function for middleware you can pass the hash as a second parameter to that function.
redirects_opts = {}
# Callback function for FaradayMiddleware::FollowRedirects
# will only be called if redirected to another url
redirects_opts[:callback] = proc do |old_response, new_response|
# you can pull the new redirected URL with this line of code.
# since you have access to the new url you can make a variable or
# instance vairable to keep track of the current URL
puts 'new url', new_response.url
end
#base_client = Faraday.new(url: url, ssl: { verify: true, verify_mode: 0 }) do |c|
c.request :multipart
c.request :url_encoded
c.response :json, content_type: /\bjson$/
c.use FaradayMiddleware::FollowRedirects, redirects_opts //<- pass hash here
c.adapter Faraday.default_adapter
end

Answer 2

Actually, I think I just found the answer based on the post here: https://stackoverflow.com/a/20818142/4701287
I need to compare the original url i passed in with the resulting url. Extending my example from above:
original_url = 'http://www.example.com/redirect'
resp = conn.get(original_url)
was_redirected = (original_url == resp.to_hash[:url].to_s)