Rails: Middleware: Remove header from response

Sometimes it is desirable to suppress headers in a response. It is convenient to use rack middleware to accomplish this task. The class we will use for this is called HeaderDelete. Make an entry in application.rb for this class to be called before rack middleware:

require File.expand_path('../boot', __FILE__)

require 'rails/all'
require 'csv'

Bundler.require(:default, Rails.env)

module SampleApp
  class Application < Rails::Application
    config.middleware.insert_before Rack::Runtime, "HeaderDelete"
  end
end

 

The class itself is self expanatory regarding which headers are targeted for removal:

class HeaderDelete
  def initialize(app, options = {})
    @app, @options = app, options
  end

  def call(env)
    r = @app.call(env)

    #[status, headers, response] = r

    r[1].delete "X-Runtime"
    r[1].delete "X-Powered-By"
    r[1].delete "Server"
    r
  end
end