Introduction

HTTP/2 is the next-generation HTTP protocol that improves website performance and efficiency. It is designed to reduce latency, enhance security, and optimize network resource usage compared to HTTP/1.1.

In Microsoft IIS (Internet Information Services), HTTP/2 is supported starting from Windows Server 2016 and Windows 10.

This guide will walk you through enabling HTTP/2 on Windows and IIS.

Step 1 - Check if HTTP/2 is enabled in the Windows Registry

Press Win + R and type regedit and hit enter. Now navigate to the following path:

There should be an entry called EnableHttp2 with a value of 2.

Step 2 - If it’s not enabled, enable it

Should there be no such value or a value of 0, you will need to enable it. Press Win + R and type powershell and execute the following (privileged) command:

You will then also need to restart IIS.

Step 3 - Verify

Open the Developer Tools by pressing F12 in Chrome / Firefox / Edge and open up your page. Make sure you have the Protocol column enabled and check that the value is h2.

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