diff --git a/actionpack/lib/action_dispatch/middleware/ssl.rb b/actionpack/lib/action_dispatch/middleware/ssl.rb
index 999c022535a947bce2da8b9c84acd7d455214801..0c7caef25dc6e446add7f9ddf741071361d435d6 100644
--- a/actionpack/lib/action_dispatch/middleware/ssl.rb
+++ b/actionpack/lib/action_dispatch/middleware/ssl.rb
@@ -32,11 +32,14 @@ def call(env)
 
     private
       def redirect_to_https(request)
-        url        = URI(request.url)
-        url.scheme = "https"
-        url.host   = @host if @host
-        url.port   = @port if @port
-        headers    = { 'Content-Type' => 'text/html', 'Location' => url.to_s }
+        host = @host || request.host
+        port = @port || request.port
+
+        location = "https://#{host}"
+        location << ":#{port}" if port != 80
+        location << request.fullpath
+
+        headers = { 'Content-Type' => 'text/html', 'Location' => location }
 
         [301, headers, []]
       end
diff --git a/actionpack/test/dispatch/ssl_test.rb b/actionpack/test/dispatch/ssl_test.rb
index 94969f795ab3f81c95ad4ec8712702061ab32f1c..c3598c5e8e1f4de1af1a6115225f35d0311ed923 100644
--- a/actionpack/test/dispatch/ssl_test.rb
+++ b/actionpack/test/dispatch/ssl_test.rb
@@ -196,6 +196,13 @@ def test_redirect_to_host_and_port
       response.headers['Location']
   end
 
+  def test_redirect_to_host_with_port
+    self.app = ActionDispatch::SSL.new(default_app, :host => "ssl.example.org:443")
+    get "http://example.org/path?key=value"
+    assert_equal "https://ssl.example.org:443/path?key=value",
+      response.headers['Location']
+  end
+
   def test_redirect_to_secure_host_when_on_subdomain
     self.app = ActionDispatch::SSL.new(default_app, :host => "ssl.example.org")
     get "http://ssl.example.org/path?key=value"