render_component fails when controller returns 304

[elado]

When my controller returns 304 result, the render_component fails with this error:

undefined method `redirect_url' for []:Array

on this line:

response = component_response(options, true)[2]

** if response.redirect_url **
  redirect_to response.redirect_url
else
  render :text => response.body, :status => response.status
end

The reason is because controller.dispatch(action, request) returns an array with:

[304, {"ETag"=>"....", "Cache-Control"=>"max-age=0, private, must-revalidate"}, []]

instead of the 200 result which looks like:

[200, {"Content-Type"=>"text/html; charset=utf-8", "ETag"=>"\"...\"", "Cache-Control"=>"max-age=0, private, must-revalidate }, #<ActionDispatch::Response:0x007f8eee1918b8 @writer=...

Tried to add request_env["Cache-Control"] = "no-store, no-cache, must-revalidate" as a header but no luck.