Redirect errors-origin.haskell.org to errors.haskell.org

[Bodigrim]

I discovered that besides the main https://errors.haskell.org, there is also a mirror https://errors-origin.haskell.org. I don't know who created it, but I don't think it serves any purpose other than confusing search engines (see haskellfoundation/error-message-index#537). Could it be redirected to the main domain? Or simply disabled if it's easier - I don't think we ever advertised it publicly, so unlikely to break any bookmarks.

Not sure if this is a right issue tracker for such requests, but hopefully someone will be able to give me further directions.

CC @gbaz @chreekat

[davean]

That's the origin. That's not a mirror. You can set the canonical though.

[Bodigrim]

@davean sorry, I'm pretty illiterate in this area. How can I set errors.haskell.org the canonical?

[gbaz]

https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls#rel-canonical-header-method

[chreekat]

I just checked, and errors.haskell.org is not being served by a CDN. Both names are CNAMEs for the backend:

So we could, in fact, remove the error-origin domain name right now.

Otoh, we'd need to add it back if we ever did put the site behind a CDN. That would bring us back to the current situation. So setting the canonical header is probably the best step to deal with it.