As your page neither needs https to be delivered, not is it written in HTML 5, you can easily verify it using the standard W3C validator : https://validator.w3.org/check?uri=http://primes.utm.edu/nthprime/ Philip Taylor -------- Jonny Grant wrote: > https://primes.utm.edu/nthprime/ > > I got the following unexpected response when trying to retrieve <https://primes.utm.edu/nthprime/>: > 500 Can't connect to primes.utm.edu:443 (certificate verify failed) -- Philip TaylorReceived on Wednesday, 6 July 2016 21:01:01 UTC
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