def add(key, value, raw = nil)
      new_header = Redhead::Header.new(key, raw || TO_RAW[key], value)
      self << new_header
      new_header
    end
def add(key, value, raw = nil)
      new_header = Redhead::Header.new(key, raw || TO_RAW[key], value)
      self << new_header
      new_header
    end
Similar to #[]= but allows manually setting the value of Header#raw to _raw_.