module VCR::Normalizers::Header

def normalize_headers
  new_headers = {}
  @normalized_header_keys = Hash.new {|h,k| k }
  headers.each do |k, v|
    val_array = case v
      when Array then v
      when nil then []
      else [v]
    end
    new_headers[String.new(k)] = convert_to_raw_strings(val_array)
    @normalized_header_keys[k.downcase] = k
  end if headers
  self.headers = new_headers
end