read_chunk_size

# File lib/webrick/httprequest.rb, line 293
    def read_chunk_size(socket)
      line = read_line(socket)
      if /^([0-9a-fA-F]+)(?:;(\S+))?/ =~ line
        chunk_size = $1.hex
        chunk_ext = $2
        [ chunk_size, chunk_ext ]
      else
        raise HTTPStatus::BadRequest, "bad chunk `#{line}'."
      end
    end