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Table of Contents
Open Developer Tools
View protocol information in network requests
Notes and FAQs
Home Computer Tutorials Browser How to check if a website supports HTTP/3 in Chrome

How to check if a website supports HTTP/3 in Chrome

Jul 15, 2025 am 12:52 AM
chrome HTTP/3

Chrome browser supports HTTP/3 by default since version 85; 1. Open the developer tool and select "Check" or shortcut F12/Ctrl Shift I by right-clicking the page; 2. Switch to the Network tab and refresh the page; 3. Click to request to view the Protocol field in Headers, and h3 is HTTP/3; 4. Note that some resources may use different protocols, and the website needs to deploy services that support HTTP/3, otherwise it cannot be used.

How to check if a website supports HTTP/3 in Chrome

Chrome browser supports HTTP/3 starting from version 85 and is enabled by default. If you want to know if a website is using HTTP/3, you can quickly view it through the developer tools.

How to check if a website supports HTTP/3 in Chrome

Open Developer Tools

The easiest way is to right-click anywhere in the page, select "Inspect", or press F12 or Ctrl Shift I ( Cmd Option I on Mac) to open the developer tools.

View protocol information in network requests

In the Developer Tools, switch to the Network tab and refresh the page. You will see a list of all resource requests during the page loading process.

How to check if a website supports HTTP/3 in Chrome
  • Click on any request (usually the first HTML document)
  • In the "Headers" panel on the right, scroll down to find the "General" section
  • Looking at the "Protocol" item, the content displayed may be h3 , http/1.1 or spdy/4

If h3 is displayed, it means that the current request is completed through HTTP/3.

Sometimes you may see the writing method of h3-Q050 , which is one of the identifiers that HTTP/3 is still in the experimental stage and has now been replaced by the standard version of h3 .

How to check if a website supports HTTP/3 in Chrome

Notes and FAQs

Although the method is simple, there are several details to pay attention to:

  • Not all resources will use HTTP/3: the server configuration is different, and only some resources may use HTTP/3, while others still use HTTP/1.1 or HTTP/2.
  • The website must have a service that supports HTTP/3: such as a server based on the QUIC protocol, otherwise it will not be used even if the browser supports it.
  • Chrome enables HTTP/3 by default, but some network environments such as company proxy or firewall may block it.
  • If you want to forcefully turn off or enable HTTP/3, you can search for "HTTP/3" on chrome://flags page to set it (it is not recommended to change it at will for ordinary users).

Basically that's it. It is not complicated to operate, but it is easy to ignore certain details. For example, multiple resources may use different protocol versions. It is recommended to click on several more requests to see.

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