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 that provides you with faster web performance by reducing response time. HTTP/2 maintains the familiar HTTP methods, status codes, and semantics of HTTP/1.1 to improve user experience. Although 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 imposes its own performance cost. HTTP/2 allows multiple resources to be requested on a single TCP connection.
By compressing the HTTP headers for served resources, significantly less data is sent over the wire.
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 fall back to HTTP/1.1.
To learn more about HTTP/2, visit the following resources: