HTTP/2 support in Azure Front Door
Currently, HTTP/2 support is active for all Azure Front Door configurations. No further action is required from customers.
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 Transport Layer Security (TLS).
HTTP/2 protocol support is available only for requests from clients to Front Door. The communication from Front Door to back ends in the back-end pool happens over HTTP/1.1.
The benefits of HTTP/2 include:
Multiplexing and concurrency
Using HTTP 1.1, 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.
By compressing the HTTP headers for served resources, time on the wire is reduced significantly.
Stream dependencies allow the client to indicate to the server which resources have priority.
HTTP/2 browser support
All of the major browsers have implemented HTTP/2 support in their current versions. Non-supported browsers automatically fallback to HTTP/1.1.
To learn more about HTTP/2, visit the following resources: