Microsoft offers a content delivery network, Azure CDN.
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StackPath Edge Delivery
Score 9.0 out of 10
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The StackPath (formerly Highwinds) Content Delivery Network provides a scalable DNS with load balancing, traffic management, DDoS protection and Web Application Firewall (WAF) to support and protect enterprise websites and applications.
Azure CDN has at hand an infinity of applications and tools to implement in your system and have better control of your data in a clean and secure platform on the web, we recommend this program since the percentage of solutions provided by this program is very high and find a way to make each user's job easier.
It is great as a primary or backup CDN. We have had no issues with performance. The cache hit ratio is high. Some of the options are hidden within the API and you have to configure them with API calls, such as configuring signed fetch requests to an S3 origin. These should be in CLI or Web Console. The deployment of edge side scripts with the CLI or CI/CD could be improved.
For the longest time they didn't have a robust SDK. They have one now, but it could be better.
The different flavors of Azure CDN (Akamai, Verizon, etc) have different costs, but not well differentiated features. Might be confusing to new users.
I'm not overly familiar with it, but AWS does have a programmability in their CDN offering (Lambda @ Edge) and Azure doesn't seem to have an equivalent (Azure Functions is region-specific).
Great support from the team whenever we're stuck. Very proactive in resolving issues and also making changes as per the requirements of the organization.
We did not evaluate any other CDN's before we selected Azure. We heavily use Azure for our development and infrastructure efforts so choosing the Azure CDN was easy. The only thing we compared it to was standing up a Windows Server VM and pointing a CDN URL to it allowing it to serve as a file server, which was much more cumbersome.
Azure CDN reduced origin instance load by removing the need to constantly serve large numbers of static files, meaning applications can be deployed with smaller/fewer instances.
Azure CDN reduces apparent load times to customers by serving cached files out of POPs in the local region of those clients, instead of requiring those clients to make multiple, lengthy requests through to the origin servers.