HTTP/2 Support in Azure CDN


HTTP/2 is a major revision to HTTP/1.1. It provides faster web performance, reduced response time, and improved user experience, while maintaining the familiar HTTP methods, status codes, and semantics. Though HTTP/2 is designed to work with HTTP and HTTPS, many client web browsers only support HTTP/2 over TLS.

HTTP/2 Benefits

The benefits of HTTP/2 include:

  • Multiplexing and concurrency

    Using HTTP 1.1, multiple making multiple resource requests requires multiple TCP connections, and each connection has performance overhead associated with it. HTTP/2 allows multiple resources to be requested on a single TCP connection.

  • Header compression

    By compressing the HTTP headers for served resources, time on the wire is reduced significantly.

  • Stream dependencies

    Stream dependencies allow the client to indicate to the server which of resources have priority.

  • Server push

    Server push allows the server to pre-emptively pushing the responses it thinks the client will need into the client's cache.


    Server push is not supported in Azure CDN.

HTTP/2 Browser Support

All of the major browsers have implemented HTTP/2 support in their current versions. Non-supported browsers will automatically fallback to HTTP/1.1.

Browser Minimum Version
Microsoft Edge 12
Google Chrome 43
Mozilla Firefox 38
Opera 32
Safari 9

Enabling HTTP/2 Support in Azure CDN

Currently HTTP/2 support is active for Azure CDN from Akamai profiles. No further action is required from customers.

HTTP/2 with Azure CDN from Verizon profiles is not currently supported.

Next Steps

To see the benefits of HTTP/2 in action, see this demo from Akamai.

To learn more about HTTP/2, visit the following resources:

To learn more about Azure CDN's available features, see the Azure CDN Overview.