Laravel "return redirect" not working on Heroku

I have a larval application I've recently deployed to a Heroku server and set up SSL for.

I have a couple instances of the following code which is called in various functions that should all redirect to the same spot. All the code in the related functions preceding it executes correctly.

return redirect('/cart');

Locally, this works as intended, but on heroku it returns http://ift.tt/1iD8FUm

Accessing the the url /cart works correctly when not using "redirect".

I've checked the error logs on heroku and they don't show anything particularly helpful, just a request to the route that later returns the redirect.

via Chebli Mohamed