header.rb 349 Bytes
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def set_header(key, value)
  header_method = nil
  if defined?(page) && ! page.driver.nil?
    header_method = [:add_header, :header].find(&page.driver.method(:respond_to?))
  end

  raise StandardError.new("No header setting method available in current driver: #{page.driver}") unless header_method
  page.driver.send(header_method, key, value)
end