Encourage use of https:// in SITEURL

Refs #2183 #2186

docs/settings.rst

@@ -203,10 +203,12 @@ Basic settings
 
 .. data:: SITEURL
 
-   Base URL of your website. Not defined by default, so it is best to specify
+   Base URL of your web site. Not defined by default, so it is best to specify
    your SITEURL; if you do not, feeds will not be generated with
-   properly-formed URLs. You should include ``http://`` and your domain, with
-   no trailing slash at the end. Example: ``SITEURL = 'http://mydomain.com'``
+   properly-formed URLs. If your site is available via HTTPS, this setting
+   should begin with ``https://`` — otherwise use ``http://``. Then append your
+   domain, with no trailing slash at the end.
+   Example: ``SITEURL = 'https://example.com'``
 
 .. data:: STATIC_PATHS = ['images']
 

pelican/tools/pelican_quickstart.py

@@ -246,7 +246,7 @@ needed by Pelican.
     CONF['lang'] = ask('What will be the default language of this web site?',
                        str_compat, args.lang or CONF['lang'], 2)
 
-    if ask('Do you want to specify a URL prefix? e.g., http://example.com  ',
+    if ask('Do you want to specify a URL prefix? e.g., https://example.com  ',
            answer=bool, default=True):
         CONF['siteurl'] = ask('What is your URL prefix? (see '
                               'above example; no trailing slash)',

pelican/tools/templates/publishconf.py.in

@@ -10,6 +10,7 @@ import sys
 sys.path.append(os.curdir)
 from pelicanconf import *
 
+# If your site is available via HTTPS, make sure SITEURL begins with https://
 SITEURL = '$siteurl'
 RELATIVE_URLS = False