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$ curl -i 'http://www.tumblr.com/ HTTP/1.1 302 Found Date: Mon, 13 Feb 2012 19:31:35 GMT Server: Apache P3P: CP="ALL ADM DEV PSAi COM OUR OTRo STP IND ONL" Location: https://www.tumblr.com/ Vary: Accept-Encoding X-Tumblr-Usec: D=15547 Content-Length: 0 Connection: close Content-Type: text/html; charset=UTF-8

$ curl -i 'http://assets.tumblr.com/images/favicon.gif?2 HTTP/1.1 200 OK Server: nginx/0.8.53 Content-Type: image/gif Last-Modified: Fri, 15 Apr 2011 22:13:30 GMT Accept-Ranges: bytes Content-Length: 635 X-Varnish: 1795992965 Cache-Control: max-age=2196224 Expires: Sat, 10 Mar 2012 05:35:30 GMT Date: Mon, 13 Feb 2012 19:31:46 GMT Connection: keep-alive

So it looks like their application is being served by Apache (and PHP), while their static assets are served by nginx behind Varnish.



Well, their assets are begin served from a CDN. Are they counting that in their server count?

  $ host assets.tumblr.com
  assets.tumblr.com is an alias for
  assets.tumblr.com.edgesuite.net.
  assets.tumblr.com.edgesuite.net is an alias for
  a1092.g.akamai.net.
  a1092.g.akamai.net has address 69.31.106.32
  a1092.g.akamai.net has address 69.31.106.50


Good catch, that's along the lines I was thinking




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