RedirectResolver

gistfile1.rb

require 'uri'
require 'net/http'
class RedirectResolver
  def self.resolve(uri)
    uri_input = uri

    if uri.is_a? String
      uri = URI.parse(uri)
    end

    response = Net::HTTP.get_response(uri)

    if response.is_a? Net::HTTPRedirection
      redirected_uri = URI.parse(response['location'])

      if redirected_uri.is_a? URI::Generic
        redirected_uri = uri.merge(redirected_uri)
      end

      resolve(redirected_uri).to_s
    else
      uri_input
    end
  end
end