I've noticed that many websites use different URLs for different languages, e.g. de.wikipedia.org.I thought that was the entire purpose of existance for the Accept-Language HTTP header. It would be easiest for me to just use that header, but I was wondering how that would be indexed.For different URLs, there is hreflang. But could I point out, Hey request this page with a different Accept-Language header and get translated content?
Indexing internationalized pages
seo;internationalization