# File lib/mechanize/util.rb, line 30
  def self.build_query_string(parameters, enc=nil)
    parameters.map { |k,v|
      # WEBrick::HTTP.escape* has some problems about m17n on ruby-1.9.*.
      [CGI.escape(k.to_s), CGI.escape(v.to_s)].join("=") if k
    }.compact.join('&')
  end