diff --git a/Vladimir_Kovalev/2/checker.rb b/Vladimir_Kovalev/2/checker.rb
new file mode 100644
index 00000000..8a487ded
--- /dev/null
+++ b/Vladimir_Kovalev/2/checker.rb
@@ -0,0 +1,116 @@
+require "csv"
+require "benchmark"
+require "net/http"
+require "digest"
+require "yaml"
+require "optparse"
+require "singleton"
+require "fileutils"
+require "domainatrix"
+
+Dir["./lib/*.rb"].each { |file| require_relative file }
+
+class Options
+  include Singleton
+  attr_accessor :verbose, :nosubdomains, :filter, :solutions, :parallel, :cache
+
+  def self.method_missing(*name)
+    instance.send(*name)
+  end
+end
+
+parser = OptionParser.new do |opts|
+  opts.banner = "Usage: checker.rb [options] file.csv"
+
+  opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
+    Options.verbose = v
+  end
+  opts.on("--no-subdomains", "Exclude subdomains") do |v|
+    Options.nosubdomains = v
+  end
+  opts.on("--filter=sales", "Body filter") do |v|
+    Options.filter = v
+  end
+  opts.on("--exclude-solutions", "Exclude OpenSource projects") do |v|
+    Options.solutions = v
+  end
+  opts.on("--parallel=N", "Using threads") do |v|
+    Options.parallel = v
+  end
+  opts.on("--no-cache", "Without cache") do |v|
+    Options.cache = v
+  end
+end
+
+begin
+  parser.parse!
+rescue OptionParser::InvalidOption => e
+  puts e
+  puts parser.help
+  exit
+end
+
+if Options.verbose
+  p Options.instance
+  p ARGV
+end
+
+if ARGV.count != 1
+  puts parser.help
+  exit
+end
+
+unless File.exist? ARGV[0]
+  puts "File not found"
+  puts parser.help
+  exit
+end
+
+Db.load_file ARGV[0]
+Db.subdomains_clear if Options.nosubdomains
+Db.populate
+
+def info(row)
+  print " #{row[:code]} (#{row[:time]}) "
+end
+
+def print_percent(step)
+  print "#{100 / Db.total * step}% - "
+end
+
+1.upto(Db.total) do |i|
+  print_percent(i) unless Options.filter
+  print "#{Db.result[i][:host]} - "
+
+  cached = UrlCache.fetch(Db.result[i][:host])
+  if cached = UrlCache.fetch(Db.result[i][:host])
+    Db.result[i] = cached
+    puts " cached #{info(Db.result[i])}"
+    next
+  end
+
+  uri = URI::HTTP.build(host: Db.result[i][:host])
+  res = nil
+
+  begin
+    time = Benchmark.measure do
+      res = Net::HTTP.get_response(uri)
+    end
+    time_string = if time.real.truncate.positive?
+        "#{time.real.truncate}s"
+      else
+        "#{time.real.to_s.split(".")[1][0..2]}ms"
+      end
+    Db.result[i].merge!({ code: res.code,
+                          time: time_string,
+                          body: Body.new(res.body) })
+  rescue => e
+    Db.result[i].merge!({ code: e.message })
+  ensure
+    UrlCache.push(Db.result[i][:host], Db.result[i])
+  end
+
+  info(Db.result[i])
+  puts "done"
+end
+puts Db.out
diff --git a/Vladimir_Kovalev/2/lib/body.class.rb b/Vladimir_Kovalev/2/lib/body.class.rb
new file mode 100644
index 00000000..80c29c54
--- /dev/null
+++ b/Vladimir_Kovalev/2/lib/body.class.rb
@@ -0,0 +1,11 @@
+class Body
+  attr_reader :body
+
+  def initialize(body)
+    @body = body
+  end
+
+  def match_keyword?(keyword)
+    !@body.scan(/#{keyword}/).empty?
+  end
+end
diff --git a/Vladimir_Kovalev/2/lib/db.class.rb b/Vladimir_Kovalev/2/lib/db.class.rb
new file mode 100644
index 00000000..d4a8ce6e
--- /dev/null
+++ b/Vladimir_Kovalev/2/lib/db.class.rb
@@ -0,0 +1,49 @@
+class Db
+  class << self
+    def load_file(csv_file)
+      @@all_data = CSV.read(csv_file).uniq
+    end
+
+    def csv
+      @@all_data
+    end
+
+    def subdomains_clear
+      @@all_data.reject! do |e|
+        subdomain = Domainatrix.parse(e).subdomain
+        true if subdomain.length.positive? && subdomain != "www"
+      end
+    end
+
+    def total
+      @@all_data.count
+    end
+
+    def populate
+      @@result = {}
+      @@all_data.each.with_index(1) do |e, i|
+        @@result[i] = { host: e[0] }
+      end
+    end
+
+    def result
+      @@result
+    end
+
+    def out
+      out = { Total: 0, Success: 0, Failed: 0, Errored: 0 }
+      @@result.map { |e| e[1][:code] }.each do |e|
+        case e
+        when /^[23]/
+          out[:Success] += 1
+        when /^[45]/
+          out[:Failed] += 1
+        else
+          out[:Errored] += 1
+        end
+        out[:Total] += 1
+      end
+      out
+    end
+  end
+end
diff --git a/Vladimir_Kovalev/2/lib/urlcache.class.rb b/Vladimir_Kovalev/2/lib/urlcache.class.rb
new file mode 100644
index 00000000..6d97ffb2
--- /dev/null
+++ b/Vladimir_Kovalev/2/lib/urlcache.class.rb
@@ -0,0 +1,33 @@
+class UrlCache
+  @@cache_dir_name = ".cache"
+  @@cache_dir = File.join(Dir.pwd, @@cache_dir_name)
+  class << self
+    def fetch(url)
+      f = self.filename(url)
+      puts "#{Time.now.to_i - File.atime(f).to_i} < #{60 * 60}" if Options.verbose
+      if self.exist?(f) && (Time.now.to_i - File.atime(f).to_i) < 60 * 60
+        YAML.safe_load(IO.read(f))
+      else
+        false
+      end
+    end
+
+    def hash_of_file(url)
+      Digest::MD5.hexdigest url
+    end
+
+    def filename(url)
+      File.join(@@cache_dir, hash_of_file(url))
+    end
+
+    def push(url, data)
+      FileUtils.rm self.filename(url) if self.exist?(self.filename(url))
+      IO.write(self.filename(url), data.to_yaml)
+    end
+
+    def exist?(file)
+      Dir.mkdir @@cache_dir unless Dir.exist? @@cache_dir
+      File.exist? file
+    end
+  end
+end