Get protocol + host name from URL

In my Django app, I need to get the host name from the referrer in request.META.get('HTTP_REFERER') along with its protocol so that from URLs like:

• https://docs.google.com/spreadsheet/ccc?key=blah-blah-blah-blah#gid=1
• https://stackoverflow.com/questions/1234567/blah-blah-blah-blah
• http://www.example.com
• https://www.other-domain.com/whatever/blah/blah/?v1=0&v2=blah+blah ...

I should get:

• https://docs.google.com/
• https://stackoverflow.com/
• http://www.example.com
• https://www.other-domain.com/

I looked over other related questions and found about urlparse, but that didn't do the trick since

>>> urlparse(request.META.get('HTTP_REFERER')).hostname
'docs.google.com'

You should be able to do it with urlparse (docs: python2, python3):

from urllib.parse import urlparse
# from urlparse import urlparse  # Python 2
parsed_uri = urlparse('http://stackoverflow.com/questions/1234567/blah-blah-blah-blah' )
result = '{uri.scheme}://{uri.netloc}/'.format(uri=parsed_uri)
print(result)

# gives
'http://stackoverflow.com/'

https://github.com/john-kurkowski/tldextract

This is a more verbose version of urlparse. It detects domains and subdomains for you.

From their documentation:

>>> import tldextract
>>> tldextract.extract('http://forums.news.cnn.com/')
ExtractResult(subdomain='forums.news', domain='cnn', suffix='com')
>>> tldextract.extract('http://forums.bbc.co.uk/') # United Kingdom
ExtractResult(subdomain='forums', domain='bbc', suffix='co.uk')
>>> tldextract.extract('http://www.worldbank.org.kg/') # Kyrgyzstan
ExtractResult(subdomain='www', domain='worldbank', suffix='org.kg')

ExtractResult is a namedtuple, so it's simple to access the parts you want.

>>> ext = tldextract.extract('http://forums.bbc.co.uk')
>>> ext.domain
'bbc'
>>> '.'.join(ext[:2]) # rejoin subdomain and domain
'forums.bbc'