handle_redirect_loop_if_appears

	class ApplicationController < ActionController::Base
	…
	before_filter :handle_redirect_loop_if_appears
	…
	after_filter :set_session_back_url
	…
	def handle_redirect_loop_if_appears
	return session[:redirect_loop_count] = nil unless request_repeats?
	return session[:redirect_loop_count] = 1 unless session[:redirect_loop_count]
	max_observed_time_diff_betn_reqs_when_in_loop = 10000
	max_loop_count = 3
	session[:last_request_time] = Time.now.to_i
	session[:redirect_loop_count] += 1
	return if session[:redirect_loop_count] < max_loop_count
	if last_request_after < max_observed_time_diff_betn_reqs_when_in_loop
	session[:last_request_time] = nil
	session[:redirect_loop_count] = nil
	redirect_to rescue_url and return
	end
	end
	def last_request_after
	return unless session[:last_request_time]
	time_diff = Time.now.to_i – session[:last_request_time].to_i
	time_diff = time_diff * (–1) if time_diff < 0
	end
	def rescue_url
	home_url
	end
	def home_url
	'/'
	end
	def request_repeats?
	session[:back_url] == request.fullpath
	end
	def set_session_back_url
	return unless request.get?
	return if request.xhr?
	session[:back_url] = request.fullpath
	end
	…
	end

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handle_redirect_loop_if_appears.rb

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