3 files changed, 4 insertions, 50 deletions
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 736c36c7b4..76f802d328 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove deprecated support to `:back` in `redirect_to`.
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated support to passing status as option `head`.
 
     *Rafael Mendonça França*
diff --git a/actionpack/lib/action_controller/metal/redirecting.rb b/actionpack/lib/action_controller/metal/redirecting.rb
index 2bd4296aff..baa34e5d27 100644
--- a/actionpack/lib/action_controller/metal/redirecting.rb
+++ b/actionpack/lib/action_controller/metal/redirecting.rb
@@ -104,14 +104,6 @@ module ActionController
         options
       when String
         request.protocol + request.host_with_port + options
-      when :back
-        ActiveSupport::Deprecation.warn(<<-MESSAGE.squish)
-          `redirect_to :back` is deprecated and will be removed from Rails 5.1.
-          Please use `redirect_back(fallback_location: fallback_location)` where
-          `fallback_location` represents the location to use if the request has
-          no HTTP referer information.
-        MESSAGE
-        request.headers["Referer"] || raise(RedirectBackError)
       when Proc
         _compute_redirect_to_location request, options.call
       else
diff --git a/actionpack/test/controller/redirect_test.rb b/actionpack/test/controller/redirect_test.rb
index 495e41ce76..0e61b92bcf 100644
--- a/actionpack/test/controller/redirect_test.rb
+++ b/actionpack/test/controller/redirect_test.rb
@@ -56,10 +56,6 @@ class RedirectController < ActionController::Base
     redirect_to("/things/stuff", status: 301)
   end
 
-  def redirect_to_back_with_status
-    redirect_to :back, status: 307
-  end
-
   def redirect_back_with_status
     redirect_back(fallback_location: "/things/stuff", status: 307)
   end
@@ -88,10 +84,6 @@ class RedirectController < ActionController::Base
     redirect_to "//www.rubyonrails.org/"
   end
 
-  def redirect_to_back
-    redirect_to :back
-  end
-
   def redirect_to_existing_record
     redirect_to Workshop.new(5)
   end
@@ -206,17 +198,6 @@ class RedirectTest < ActionController::TestCase
     assert_equal "http://test.host/things/stuff", redirect_to_url
   end
 
-  def test_redirect_to_back_with_status
-    @request.env["HTTP_REFERER"] = "http://www.example.com/coming/from"
-
-    assert_deprecated do
-      get :redirect_to_back_with_status
-    end
-
-    assert_response 307
-    assert_equal "http://www.example.com/coming/from", redirect_to_url
-  end
-
   def test_simple_redirect_using_options
     get :host_redirect
     assert_response :redirect
@@ -259,29 +240,6 @@ class RedirectTest < ActionController::TestCase
     assert_equal "//www.rubyonrails.org/", redirect_to_url
   end
 
-  def test_redirect_to_back
-    @request.env["HTTP_REFERER"] = "http://www.example.com/coming/from"
-
-    assert_deprecated do
-      get :redirect_to_back
-    end
-
-    assert_response :redirect
-    assert_equal "http://www.example.com/coming/from", redirect_to_url
-  end
-
-  def test_redirect_to_back_with_no_referer
-    assert_raise(ActionController::RedirectBackError) {
-      @request.env["HTTP_REFERER"] = nil
-
-      assert_deprecated do
-        get :redirect_to_back
-      end
-
-      get :redirect_to_back
-    }
-  end
-
   def test_redirect_back
     referer = "http://www.example.com/coming/from"
     @request.env["HTTP_REFERER"] = referer