class Bundler::Fetcher::Downloader

def request(uri, headers)
  validate_uri_scheme!(uri)
  filtered_uri = URICredentialsFilter.credential_filtered_uri(uri)
  Bundler.ui.debug "HTTP GET #{filtered_uri}"
  req = Gem::Net::HTTP::Get.new uri.request_uri, headers
  if uri.user
    user = CGI.unescape(uri.user)
    password = uri.password ? CGI.unescape(uri.password) : nil
    req.basic_auth(user, password)
  end
  connection.request(uri, req)
rescue OpenSSL::SSL::SSLError
  raise CertificateFailureError.new(uri)
rescue *HTTP_ERRORS => e
  Bundler.ui.trace e
  if e.is_a?(SocketError) || e.message.to_s.include?("host down:")
    raise NetworkDownError, "Could not reach host #{uri.host}. Check your network " \
      "connection and try again."
  else
    raise HTTPError, "Network error while fetching #{filtered_uri}" \
      " (#{e})"
  end
end