Caches have also become much more intelligent, providing the ability to inspect information contained in the request header and vary the response based on device type, requestor information, query string, or cookie settings. CDNs can be directed to retrieve objects from multiple origins, enforce protocol policy, negotiate SSL connections, and restrict object access by location or authentication credentials. The recently developed ability to

perform logic computations at edge locations provides even more flexibility for dynamic web applications. The CDN is able to quickly inspect requests and modify the behavior of the caching logic, authentication, and even modify the content as it is being delivered or ingested. Pushing application logic to an edge has provided new possibilities for application developers and off loaded origin compute requirements to a distributed intelligent network.

Finally, there is the capability for a CDN to provide network and application level protection preventing harm or loss of service by filtering traffic with web application firewalls and DDoS protection services integrated at the edge locations and integrated into the caching network. The combination of security controls and very large amounts of network bandwidth keeps bots, scrapers, and hackers at bay without compromising application availability or performance.

Amazon CloudFront is a large scale, global, and feature rich CDN that provides secure, scalable and intelligently integrated application delivery. A diagram on how Amazon CloudFront integrates into AWS components is shown in the following diagram.