'Prefix "http://" valid but actually ""https://"

A long list of incomplete websites, some missing prefix like "http://www." etc.

pewresearch.org
narod.ru
intel.com
xda-developers.com
oecd.org

I tried:

import requests
from lxml.html import fromstring

to_check = [
"pewresearch.org",
"narod.ru",
"intel.com",
"xda-developers.com",
"oecd.org"]

for each in to_check:
    r = requests.get("http://www." + each)
    tree = fromstring(r.content)
    title = tree.findtext('.//title')
    print (title)

They returned:

Pew Research Center | Pew Research Center
Лучшие конструкторы сайтов | Народный рейтинг конструкторов для создания сайтов
Intel | Data Center Solutions, IoT, and PC Innovation
XDA Portal & Forums
Home page - OECD

Seems theirs all started with "http://www.", however not - because for example, the right one is "https://www.pewresearch.org/".

What's the quickest way, with online tool or Python, that I can find out their complete and correct addresses, instead of keying them one-by-one in web browser? (some might be http, some https)

Thank you.

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'Prefix "http://" valid but actually ""https://"

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