compare.rb

require "net/http"

def get_diff_percentage(url)
  res = nil
  res_webp = nil
  url.sub!("http://", "")
  server, *path = url.split("/")
  path = "/#{path.join("/")}"
  path_webp = "#{path}_.webp"

  Net::HTTP.start(server, 80) { |http|
    res = http.head path
    res_webp = http.head path_webp
  }

  size = res["Content-Length"].to_i
  size_webp = res_webp["Content-Length"].to_i

  ret = (size-size_webp).to_f / size.to_f
  ret
end

def get_average(imgs)
  total = 0.0
  p "getting"
  imgs.each do |img|
    perc = get_diff_percentage(img)
    p perc
    total += perc
  end
  average = total.to_f / imgs.size
  left = ((1-average)*100).round(2)
  p "-------"
  p "count: #{imgs.size}, average: #{average}, save: #{left}%"
  p ""
  p ""
end

index_p4p_imgs = [
  "http://img02.taobaocdn.com/bao/uploaded/i2/17928031428644105/T1JBQ4XodXXXXXXXXX_!!0-item_pic.jpg_120x120.jpg",
  "http://img02.taobaocdn.com/bao/uploaded/i2/899421123/T2w7YwXd8aXXXXXXXX_!!899421123.jpg_120x120.jpg",
  "http://img01.taobaocdn.com/bao/uploaded/i1/815242864/T2wxvuXjpaXXXXXXXX_!!815242864.jpg_120x120.jpg",
  "http://img02.taobaocdn.com/bao/uploaded/i2/11299020571160598/T1wt0LXClXXXXXXXXX_!!0-item_pic.jpg_120x120.jpg",
  "http://img01.taobaocdn.com/bao/uploaded/i1/897618233/T2kUbrXnXXXXXXXXXX_!!897618233.jpg_120x120.jpg",
  "http://img02.taobaocdn.com/bao/uploaded/i2/884392429/T2wHirXgNbXXXXXXXX_!!884392429.jpg_120x120.jpg",
  "http://img04.taobaocdn.com/bao/uploaded/i4/1128267916/T2YVToXddXXXXXXXXX_!!1128267916.jpg_120x120.jpg",
  "http://img02.taobaocdn.com/bao/uploaded/i2/1036315960/T2oAVXXnpOXXXXXXXX_!!1036315960.jpg_120x120.jpg",
  "http://img02.taobaocdn.com/bao/uploaded/i2/1056092017/T28AYgXcxbXXXXXXXX_!!1056092017.jpg_120x120.jpg",
  "http://img03.taobaocdn.com/bao/uploaded/i3/105638796/T2h2bxXbNaXXXXXXXX_!!105638796.jpg_120x120.jpg",
  "http://img01.taobaocdn.com/bao/uploaded/i1/51289504/T2552lXgRXXXXXXXXX_!!51289504.jpg_120x120.jpg",
  "http://img01.taobaocdn.com/bao/uploaded/i1/290867105/T2v9iPXltbXXXXXXXX_!!290867105.jpg_120x120.jpg"
]

detail_imgs = [
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2c4zjXXlaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2ZEbkXaFaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2ZEbkXaFaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2ZEbkXaFaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2ZEbkXaFaXXXXXXXX_!!82937928.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/82937928/T2CO5.XXBaXXXXXXXX_!!82937928.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/82937928/T2VKaJXXxcXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T22tfgXXVbXXXXXXXX_!!82937928.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/82937928/T2t7PjXkFXXXXXXXXX_!!82937928.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/82937928/T24k_jXiJXXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T2u2rjXlhaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T22hnfXb8bXXXXXXXX_!!82937928.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/82937928/T2OoTiXolaXXXXXXXX_!!82937928.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/82937928/T24gnjXcVaXXXXXXXX_!!82937928.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/82937928/T236rjXhFXXXXXXXXX_!!82937928.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/82937928/T2kRTjXidXXXXXXXXX_!!82937928.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/82937928/T24srjXgRaXXXXXXXX_!!82937928.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/82937928/T2ICHjXeRXXXXXXXXX_!!82937928.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2Fn15XchbXXXXXXXX_!!899421123.jpg",
  "http://img03.taobaocdn.com/imgextra/i3/899421123/T2NFDwXbFaXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T22vYvXiRaXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T2el6vXjxaXXXXXXXX_!!899421123.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2bjrwXl4XXXXXXXXX_!!899421123.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/899421123/T2Nm6oXodaXXXXXXXX_!!899421123.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/899421123/T2K6jvXhlaXXXXXXXX_!!899421123.jpg",
  "http://img01.taobaocdn.com/imgextra/i1/899421123/T2bVYwXd4aXXXXXXXX_!!899421123.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2Ah2wXhBXXXXXXXXX_!!899421123.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2_6vbXb4bXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T2.qDwXipaXXXXXXXX_!!899421123.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2g82vXf4aXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T25lC3Xg8bXXXXXXXX_!!899421123.jpg",
  "http://img02.taobaocdn.com/imgextra/i2/899421123/T2ZyzwXbhXXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T2J1SPXgBbXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T2bjPwXlBXXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T22QOEXm4bXXXXXXXX_!!899421123.jpg",
  "http://img04.taobaocdn.com/imgextra/i4/899421123/T26AWUXdpbXXXXXXXX_!!899421123.jpg"
]

get_average index_p4p_imgs
get_average detail_imgs

"getting"
0.7902973395931142
0.6857616863472236
0.7906659169411198
0.5745135770793244
0.6484659386375455
0.5130982863896002
0.6294546436285097
0.8282554728052358
0.7718571763419018
0.7712054660810151
0.6854607699294348
0.6322784204990917
"-------"
"count: 12, average: 0.6934428911894264, save: 30.66%"
""
""
"getting"
0.6531676130012966
0.7241379310344828
0.7241379310344828
0.7241379310344828
0.7241379310344828
0.5722226654964228
0.6647289536349629
0.26953125
0.8755439564008243
0.8750868716787705
0.8920375834706088
0.866639389487127
0.8785529798258749
0.8584061035021602
0.8795648585790382
0.8613427816324037
0.8541312805655794
0.8393498849897268
0.48623719496960105
0.7064035659926071
0.8056513486780549
0.9997686598539283
0.7017661348565426
0.6015760569993671
0.48376060973497315
0.814585635359116
0.829912582781457
0.8057104508571777
0.6910318746623447
0.49704674487475253
0.80663612221671
0.8126462482450211
0.8093083723348934
0.812484993997599
0.4925620414518118
0.5215805663907652
"-------"
"count: 36, average: 0.7337646416849845, save: 26.62%"
""
""