Innovation Cloud - Step 16 - ActionController::InvalidAuthenticityToken


I’m currently working on the Innovation Cloud project.

As seen in the following topics The action index could not be found for SignupsController, Receiving error the action index could not be found and Can’t get form to redirect to thanks_url, the browser goes to https://localhost/signups and I can’t figure out why.

However, the index error only shows up when I refresh the browser because I’m also getting an ActionController::InvalidAuthenticityToken in SignupsController#create error when I click on the submit button.

Here’s what I see in the console:
Started POST "/signups" for at 2020-06-05 17:58:40 +0000 Processing by SignupsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"ISh57AUCeODOur3cP1nkurexm13tyQhVI1d1UrgfQ2o=", "signup"=>{"email"=>""}, "commit"=>"Join"} Can't verify CSRF token authenticity Completed 422 Unprocessable Entity in 1ms

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So this doesn’t solve the underlying problem, but will allow you to get beyond this issue for further practice —

In your signups controller, add this line above any of your actions

  skip_before_action :verify_authenticity_token

This basically tells the signup controller to not care about the authenticity token. You should not do this in a production app, but inside codecademy for practice/learning, it’s probably fine.


Thanks for the tip. I was able to complete the project.

Just out of curiosity, what could be the cause of such an issue?

@evanfreeze Thanks for the solution, it also helped me out. I’m also curious to know what was causing an invalid authenticity token? Can anyone explain?