Table of Content

• Syntax
• Directives
• Examples
• Browser Compatibility

The Sec-CH-UA-Full-Version is a Client Hints header in HTTP transactions. Its main purpose is to provide detailed version information about the user's browser, beyond what Sec-CH-UA often provides. Thus, this auxiliary to the Sec-CH-UA allows more specific functions which require particular browser versions to be made use of, enhancing user experience and making operations more efficient.

Syntax

Sec-CH-UA-Full-Version: "<product>;<version>"Copy

In the syntax, the <product> is the browser's product name and <version> is the full version of the user's browser.

Directives

There are two main components or directives for the Sec-CH-UA-Full-Version header.

1. <product> - The product token of the user agent's browser.
2. <version> - The full version of the user's browser.

Examples

Using Chrome as an example, a typical Sec-CH-UA-Full-Version header would look something like this:

Sec-CH-UA-Full-Version: "Chrome;92.0.4515.131"Copy

In this instance, "Chrome" is the product and "92.0.4515.131" is the full version.

Browser Compatibility

How to modify Sec-CH-UA-Full-Version header

ModHeader is a Chrome extensions that can modify HTTP headers. You can use it to change the Sec-CH-UA-Full-Version header, which can be useful for testing how your website or web application behaves with different browser versions.

To modify the Sec-CH-UA-Full-Version with ModHeader, follow these steps:

1. Install and open the ModHeader extension.
2. Click "Add" to create a new header modification.
3. In the "Name" field, input Sec-CH-UA-Full-Version.
4. In the "Value" field, input your desired browser product and version, for example, "Firefox;68.0.2".
5. Now, all your browsing in Chrome will send the modified Sec-CH-UA-Full-Version header.

Remember, this change only affects the HTTP headers sent from your browser and does not actually change your browser version.