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![Configure Mappings to CDNs
$server_config["image"] = array(
'akamai' => array(
'img0-ak.etsystatic.com',
'img1-ak.etsystat...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-44-2048.jpg?cb=1666152107)
![Test Controls
$server_config['ab']['cdn'] = array(
'enabled' => 'on',
'weights' => array(
'akamai'
=> 0.0,
'edgecast' => 0...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-45-2048.jpg?cb=1666152107)
![Balancing Traffic Using DNS
[2589:~] $ dig +short www.etsy.com
www.etsy.com.edgekey.net.
e2463.b.akamaiedge.net.
23.74.122...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-67-2048.jpg?cb=1666152107)
![Balancing Traffic Using DNS
[2589:~] $ dig +short www.etsy.com
etsy.com.
[2589:~] $ dig +short www.etsy.com
38.123.123.123...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-68-2048.jpg?cb=1666152107)
![Failure Beacons
1. 1x1 tracking pixel embedded in page
[...]
<img src="//failure.etsy.com/status/images/beacon.gif?
beacon...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-94-2048.jpg?cb=1666152107)
![Failure Beacons
▪ Optional extra debugging information
[31/Oct/2013:07:06:42 +0000] "GET /status/images/
beacon.gif?beacon...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-104-2048.jpg?cb=1666152107)
![Tracking Requests to Origin
GET / HTTP/1.1
User-Agent: curl/7.24.0
Accept: */*
X-Forwarded-Host: www.etsy.com
[...]
X-CDN-...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-106-2048.jpg?cb=1666152107)
![Tracking Requests to Origin
GET / HTTP/1.1
User-Agent: curl/7.24.0
Accept: */*
X-Forwarded-Host: www.etsy.com
[...]
X-CDN-...](https://image.slidesharecdn.com/cdnpresentation-2013-11-13reduced-131114103211-phpapp01/75/integrating-multiple-cdns-at-etsy-107-2048.jpg?cb=1666152107)
