pic_dl.rb

require 'net/http'
require 'net/https'

path = "https://2ch.hk/pr/res/380039.html"

uri = URI(path)

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

def get_cookie(header)
  header.slice(0, header.index(";"))
end

res = http.get(uri.path)
cfduid = get_cookie res["set-cookie"]

wtf_is_this_url = "https://2ch.hk/cdn-cgi/l/chk_jschl?jschl_vc=cb51d68ec5e478745fa6617e6c5ac683&jschl_answer=314"
res = http.get(wtf_is_this_url, { "cookie" => cfduid })

cf_clearance = get_cookie res["set-cookie"]

res = http.get(path, { "cookie" => "#{cfduid}; #{cf_clearance}" })

p res # <Net::HTTPOK 200 OK readbody=true>