Delete HTTP_X_QUEUE_START for requests with large content lengths.

queue_time_middleware.rb

class QueueTimeMiddleware
  def initialize(app)
    @app = app
  end

  def call(env)
    if env['CONTENT_LENGTH'].to_i > 10000
      env['HTTP_X_QUEUE_START'] = nil
    end

    @app.call(env)
  end
end