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Amazon CloudFront (MathJax's CDN) supports HTTPS, but their SSL certificate only applies to
*.cloudfront.net
urls. This retrieves the cloudfront host at runtime, and loads MathJax from there via HTTPS.The cloudfront url is apparently stable, and not dynamic, so I could just use
d3eoax9i5htok0.cloudfront.net
instead of the gethostbyname call, but this approach seemed safer to changes in Amazon's structure, and will even continue to work if MathJax moves to a new CDN that actually supports HTTPS on the MathJax domain.