Instance Public methods
protect_from_forgery(options = {})

Turn on request forgery protection. Bear in mind that GET and HEAD requests are not checked.

class ApplicationController < ActionController::Base

class FooController < ApplicationController
  protect_from_forgery except: :index

You can disable forgery protection on controller by skipping the verification before_action:

skip_before_action :verify_authenticity_token

Valid Options:

  • :only/:except - Only apply forgery protection to a subset of actions. For example only: [ :create, :create_all ].

  • :if/:unless - Turn off the forgery protection entirely depending on the passed Proc or method reference.

  • :prepend - By default, the verification of the authentication token will be added at the position of the

    protect_from_forgery call in your application. This means any callbacks added before are run first. This is useful
    when you want your forgery protection to depend on other callbacks, like authentication methods (Oauth vs Cookie auth).
    If you need to add verification to the beginning of the callback chain, use <tt>prepend: true</tt>.
  • :with - Set the method to handle unverified request.

Valid unverified request handling methods are:

  • :exception - Raises ActionController::InvalidAuthenticityToken exception.

  • :reset_session - Resets the session.

  • :null_session - Provides an empty session during request but doesn't reset it completely. Used as default if :with option is not specified.

# File actionpack/lib/action_controller/metal/request_forgery_protection.rb, line 122
def protect_from_forgery(options = {})
  options = options.reverse_merge(prepend: false)

  self.forgery_protection_strategy = protection_method_class(options[:with] || :null_session)
  self.request_forgery_protection_token ||= :authenticity_token
  before_action :verify_authenticity_token, options
  append_after_action :verify_same_origin_request