Knowledgebase: AISO CDN
What is HTTP Pull CDN?
Posted by Support on 08 June 2012 10:22 AM

HTTP Pull is probably the most frequently used CDN method/protocol. It's recommended for the delivery of small static content via CDN edge servers - content like images, css and pdf files. With HTTP Pull, content is cached on edge servers when a user requests that content. 

The detailed workflow is as follows:

(1) A visitor requests content from a website.

(2) The AISO core CDN logic determines which edge server is best placed to deliver that content.

(3) If the content is not already cached on that edge server, the CDN pulls the content from the origin via HTTP port 80.

Site owners may set the cache expiry on the origin, or define it in the advanced settings of the relevant CDN Resource.

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