read_header

# File lib/webrick/httprequest.rb, line 312
    def read_header(socket)
      if socket
        while line = read_line(socket)
          break if /\A(#{CRLF}|#{LF})\z/m =~ line
          @raw_header << line
        end
      end
      @header = HTTPUtils::parse_header(@raw_header.join)
    end