When you have more than one webspace in your Sulu installation you should provide a default main webspace and optional additional webspaces for which the article is valid.
Normally an article will be delivered only for the main webspace. Further an article can be delivered for the additional webspaces which are configured. To prevent duplicate content issues a canonical tag with the url for the main webspace is inclued in the HTML head.
More information about this topic:
- Duplicate content: https://moz.com/learn/seo/duplicate-content
- Canonicalization: https://moz.com/learn/seo/canonicalization
For each article the default webspace configuration can be overwritten by the content manager.
The twig method sulu_content_path can generate url with another webspace.
Just give this method the targetWebspace of the article as second argument.
For example: sulu_content_path(article.routePath, article.targetWebspace).