data-xwiki-rest-url starts with "//" when xwiki.home contains domain with trailing "/"

Problem:

Value of "data-xwiki-rest-url" data attribute starts with "//"

data-xwiki-rest-url="//xwiki/rest/wikis/xwiki/spaces/Main/pages/WebHome"

Consequences:

Functionalities using xm.restURL or $services.rest.url are not working. Most apparent on annotations(if enabled) - as they are fetched via rest api on every page. See https://forum.xwiki.org/t/problem-when-fetching-annotations-after-switching-to-pathbased-false/7886

How to replicate:

XWIKI version 12.9 - .deb installed on Ubuntu 20+ (tomcat9 + nginx) on www.yourdomain.com

xwiki.properties

• url.standard.multiwiki.isPathBased=false

xwiki.cfg

• xwiki.virtual.usepath=0
• xwiki.home=http://www.yourdomain.com/

1 other subwiki active on different domain (not sure if this is relevant)

As long as xwiki.home value contains trailing "/" then value of "data-xwiki-rest-url" attribute on html tag starts with "//". When trailing "/" is removed from xwiki.home then "data-wiki-rest-url" contains correct values.

Note that in xwiki.cfg in the comment section it is explicitly recommended to use trailing /.