You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: link_filter.rb
    path of file: ./repos/sugar/app/filters
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class LinkFilter < Filter
  HTTPS_WHITELIST = %w[
    yout
    
  def https_url_exists?(url)
    uri = URI.parse(url.gsub(%r{^(https?:)//}, "https://"))
    begin
      head_request(uri) =~ /^(2|3)\d\d$/
    rescue SocketError, Net::OpenTimeout,
           OpenSSL::SSL::SSLError, Errno::ECONNREFUSED
      false
    rescue StandardError => e
      logger.error "Unexpected connection error #{e.inspect}"
      false
    end