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I typed in http://area51.stackexchange.com and I did not get redirected to the https version. Is this intentional or a bug?
The redirection works for stackoverflow and stackexchange
It redirects for me. Maybe the redirect has been corrected/added since you posted the question?
https://area51.meta.stackexchange.com uses the HTTPS protocol but http://area51.stackexchange.com does not.
I think this may be that they have not installed a SSL Certificate on all servers or included it in the area51 subdomain