RFC downloader not working

[sidsr003]

I am using the following code to download rfc pages. I am however getting
only html and not plain English text like on the webpage http://www.ietf.org/rfc/rfc2324.txt


In the command prompt I type:

python "RFC-Downloader.py" 2324 | more

import sys, urllib.request
try:
    rfc_number = int(sys.argv[1])
except (IndexError, ValueError):
    print('Must supply an RFC number as first argument')
    sys.exit(2)
template = 'http://www.ietf.org/rfc/rfc{}.txt'
url = template.format(rfc_number)
rfc_raw = urllib.request.urlopen(url).read()
rfc = rfc_raw.decode()
print(rfc)