each_response_header

# File lib/net/http/response.rb, line 52
    def each_response_header(sock)
      key = value = nil
      while true
        line = sock.readuntil("\n", true).sub(/\s+\z/, '')
        break if line.empty?
        if line[0] == \s\ or line[0] == \t\ and value
          value << ' ' unless value.empty?
          value << line.strip
        else
          yield key, value if key
          key, value = line.strip.split(/\s*:\s*/, 2)
          raise Net::HTTPBadResponse, 'wrong header line format' if value.nil?
        end
      end
      yield key, value if key
    end