def browse_string(body)
  Tempfile.open('browse_string') do |f|
    # I recommend starting testing command with
    # BROWSER="open -a firefox" on OS X
    browser = ENV.fetch('BROWSER') { 'firefox' }
    f.write(body)
    f.close
    puts "Starting browser #{browser} with response..."
    unless system(browser + " " + f.path)
      warn "Error starting browser #{browser}"
    end
  end
end