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I have a CloudFront distribution with a configured alternative name (e.g. cdn.example.com). Is it possible to restrict access to the CDN via d1234.cloudfront.net name?

I don't want it to be indexed if we place a link to d1234.cloudfront.net by mistake.

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  • Are you able to use canonical tags to fix this? – jrtapsell Jul 9 '18 at 12:26
  • @jrtapsell We use cannonical tags. However, they do not prevent Google from indexing that other domain and showing it in search results. We already had that problem. – Ivan Nikitin Jul 9 '18 at 14:11
  • So for d1234.cloudfront.net you are serving a canonical URL on cdn.example.com? – jrtapsell Jul 9 '18 at 15:29
  • @jrtapsell Exactly. Yet, Google indexes both domains and shows them both in the search results. Probably, lower our rankings in the process since it sees duplicated content. – Ivan Nikitin Jul 9 '18 at 16:13
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The solution is uploading a separate robots.txt file for CloudFront URL. This will not block the CloudFront URL but will keep it away from google search

Create robots_cf.txt file that contains this text:

User-agent: *
Disallow: /

Now add this rule to .htaccess file (say Cloudfront URL is aaabbbcccddd.cloudfront.net):

RewriteCond %{HTTP_HOST} ^aaabbbcccddd.*$ [NC]    
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*robots\.txt.*\ HTTP/ [NC]    
RewriteRule ^robots\.txt /robots_cf.txt [NC,L]

Eventually, Google will get this and stop crawling your CloudFront URL.

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