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: network_loader.rb
    path of file: ./repos/premailer-rails/lib/premailer/rails/css_loaders
    
    the code of the file until where you have to start completion: class Premailer
  module Rails
    module CSSLoaders
  
    
        def uri_for_url(url)
          uri = URI(url)

          if uri.host.present?
            return uri if uri.scheme.present?
            URI("http:#{uri}")
          elsif asset_host_present?
            scheme, host = asset_host(url).split(%r{:?//})
            scheme, host = host, scheme if host.nil?
            scheme = 'http' if scheme.blank?
            path = url
            URI(File.join("#{scheme}://#{host}", path))
          end