如何通过get请求将JHeader中的http标头传递给Rails？

Question

I would like to pass header from jQuery ajax method to Rails. This is my request:

$.ajax({ url: "http://localhost:3000/v1/examples", method: "GET", beforeSend: function(xhr){xhr.setRequestHeader('AuthenticationKey', 'some_key');}, dataType: "json" })

And here is routes.rb:

Rails.application.routes.draw do
  namespace :v1, defaults: { format: :json } do
    devise_for :users, controllers: { sessions: "v1/sessions", registrations: "v1/registrations" }
    get 'examples', to:'examples#index'
  end
end

This get route for examples works if there is no header, but when I set custom header it doesn't.

Started OPTIONS "/v1/examples" for 127.0.0.1 at 2015-09-10 18:52:47 +0200
ActionController::RoutingError (No route matches [OPTIONS] "/v1/examples"):

How can I pass this header to my application?

Answer 1

Just do it like this:

$.ajax({ 
    url: "http://localhost:3000/v1/examples", 
    headers: {'AuthenticationKey': 'some_key'},
    dataType: "json"
})

(default method is 'GET')

Use the beforeSend function only if you want to change the default value for the header X-Requested-With: XMLHttpRequest , which is always sent.

Reference