In Google Chrome -> Network Tab -> right click -> Header Options -> select Protocol

• then you will see values like h2 (HTTP 2) or http/1.1 entry like the following picture in Protocol column

In Google Chrome you can see protocol of each requests like this

1. open developers tools with F12

2. go to Network Tab

3. right click any where in column headers (like Name in the picture) and from the context menu select Protocol to be displayed as a new column

4. then you will see values like h2 (HTTP 2) or http/1.1 entry like the following picture in Protocol column