How to know if a request is performed using HTTP 1.x or HTTP2

Question

I want to know if a request between a JavaScript Client and Node.js server is performed using HTTP1.x or HTTP2.

How I know in XMLHttpRequest, Chrome Console and Node.js what type of protocol is used ?

Answer 1

Standard one: performance.timing.nextHopProtocol

Non standard implemetation: window.chrome.loadTimes().connectionInfo

You can check in network tab of dev tools where h2 represents HTTP2,

When the Protocol column says h2 it means that the resource was sent with HTTP/2. The Protocol column is hidden by default. Right-click the table header and select Protocol to show it. See Show more information for an example.