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【Rails API】rack-corsでレスポンスヘッダーにアクセスできるようにする方法

Last updated at Posted at 2024-03-26

rack-corsをインストールしてconfig/initializers/cors.rbexposeを記述することでJavaScriptからレスポンスヘッダーにアクセスできるようになります。

Rails.application.config.middleware.insert_before 0, Rack::Cors do
  allow do
    origins 'localhost:3000'

    resource "*",
             headers: :any,
             methods: %i[get post put patch delete options head],
             expose: %w[X-Sample],
             credentials: true
  end
end

上記の場合にはX-Sampleにアクセス可能になります。

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