What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

User Agent Sample Strings

Maria Garcia
• Monday, 09 November, 2020
• 9 min read

Platform identifiers change based on the operating system being used, and version numbers also increment as time passes. Mapping UA string tokens to a more human-readable browser name for use in code is a common pattern on the web today.

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When mapping the new Edge token to a browser name, Microsoft recommends using a different name than the one developer used for the legacy version of Microsoft Edge to avoid accidentally applying any legacy workarounds that are not applicable to Chromium-based browsers. When Microsoft is notified about these types of issues, website owners are contacted and informed about the updated UA.

While all phones come with pre-installed browsers, both Google Play and Apple App Store offer a number of alternative browsers, some focusing on speed and lightness, others on saving bandwidth and blocking ads, and an ever-increasing amount claiming to increase privacy and reduce a users' mobile digital footprint. Feel free to browse the stats for your local market using our Data Explorer tool.

A simple regex solution searching for keywords will struggle in terms of accuracy and detection speed. It offers a patented algorithm that detects and identifies all devices requesting online content through parsing UA strings based on a constantly updated, massive list of connected devices.

Field Description Required $(DEVICE\_TYPE) SMART-TV is used for Samsung Smart TV. Optional Build/$(BUILD\_TAG)) Platform Build Tag is used on Android devices.

Optional $(APP\_NAME)/$(APP\_Very) Web Browsers on Samsung devices (Mobile and Smart TV) use SamsungBrowser/version ”. Mandatory (Chrome/$(CHROME\_Very)) This field is presented in a Chrome-based web browser only.

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This will also reflect on the Ti zen Samsung Browser if it will be based on Chrome in the future. For devices supporting Virtual Reality contents, use VR ”.

If PC UX is appropriate for the device, this field is empty. Optional Users can explicitly request PC content from Samsung Internet for Android via the “More > Desktop version”.

User agent string format for desktop version request is as follows. Please check below for existing Samsung Internet for Smart TV UA.

Current: Mozilla/5.0 (Linux; Android 5.0.2; SAMSUNG SM-G925K Build/LRX22G) Apple WebKit/537.36 (HTML, like Gecko) SamsungBrowser/4.0 Chrome/44.0.2403.133 Mobile VR Safari/537.36 consider the Resize Event On the Resize Event, focus should be maintained on the Input field so that the user of the TV web browser can input characters and symbols using Samsung IME.

The following table shows how the identifiers and proper contents are related. Open the test web page on the desktop Chrome Browser.

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An app or web page can read the user agent string to detect Fire TV and then provide a specific user experience. To provide an Amazon Fire TV-specific experience, test for the string “AmazonWebAppPlatform” in combination with a device model that starts with “AFT”.

It is unstructured, so parsing it results in unnecessary complexity, which is often the cause for bugs and site compatibility issues that hurt users. These issues also disproportionately hurt users of less common browsers, as sites may have failed to test against their configuration.

Response Accept-CH Requestheader RequestExample valueDescription UASec-CH-UA"Chromium";v="84","Google Chrome";v="84" List of browser brands and their significant version. UA-MobileSec-CH-UA-Mobile?1 Boolean indicating if the browser is on a mobile device (?1 for true) or not (?0 for false).

However, if another Accept-CH header is received then that will completely replace the current hints the browser is sending. While hints will persist to the next navigation, the site should not rely on or assume they will be delivered.

This will return a string with the historical entries for compatibility reasons, but with sanitized specifics. Mozilla/5.0 (compatible; bingo/2.0; + BrowserBingBotVersion2.0Browser maker Microsoft CorporationOperating systemunknownOS versionunknownFaked user agent NoCrawlerYesDevice typeunknownPointerunknown When you request a Web page, your browser sends (user agent request) a number of headers to the server hosting the site that you are visiting.

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