[Ruby] 檢查URL存在與否

  require "net/http"
  def remote_file_exists?(url)
    url = URI.parse(url)
    Net::HTTP.start(url.host, url.port) do |http|
      puts http.head(url.request_uri).code == "200"
      return http.head(url.request_uri).code == "200"
    end
  end

或

```rb   require "net/http"   def url_exist?(url_string)
url = URI.parse(url_string)
req = Net::HTTP.new(url.host, url.port)
req.use_ssl = (url.scheme == 'https')
path = url.path if url.path.present?
res = req.request_head(path || '/')
puts res.code != "404" # false if returns 404 - not found   rescue Errno::ENOENT
puts false # false if can't find the server   end   ```