User Agent Info
The tool displays the string text your web browser sends in the "User-Agent" header in the HTTP requests. The User-Agent Information identifies your browser and operating system and their versions.
In the back days, the internet was on a manual system based on commands. The user had to send the instructions to communicate. But since the evaluation of the internet, now the browsers do that job automatically.
Currently, there are more than 4.6 billion internet users in the world. From our mobile devices to our smart homes, we are always connected to the internet.
Without a browser, we cannot surf the internet. Browsers are the internet's need, equipped with loads of security policies, server agreements, and connectivity codes to run ideally. Generally, when the browser wants to connect with any website's server, it first sends the user-agent info to make the connection.
I bet you are now thinking, "what's my user agent?" It's an intermediary or middle man between you and the internet world. In simple words, it's a string of text that is unique for each software or browser on the internet and holds the technical information about your device and operating system. User-agent is present in the HTTP headers when the browser wants to connect with the webserver.
Each bit of the user agent contains some detailed information. However, there is no standard way to write the user-agent. It varies from browser to browser. Some browsers stuff the user-agent header with a lot of information.
Once a connection between a browser and web server is established, the content negotiation begins. That lets the website serve its various versions depending upon the user-agent string. Once the user-agent passes its ID card to the web server, it provides the files, media, and scripts suitable for the particular user.
Figuring the user-agent string is not only helpful to us but also for the providers. It automatically sends the correct translation of certain documents based on the language preference of the user. You may have seen this when accessing websites with a different language that is automatically translated.
To sum up, user agents are used for different purposes, and some of them are as follows.
As we discussed earlier, there is no standard way to write the user-agent string. Therefore, dnchecker.org provides a tool to decode the user-agent string to figure out everything it's saying.
To perform the task, do the following steps.
Yes, you can change your user agent, and that process is called user-agent spoofing. Sometimes, we need to test different things. For example, you are running a campaign for MAC OS, and you want to figure out that either the campaign is running correctly for MAC OS and not targeting the Linux users, changing the user-agent of the browser helps you in this regard.
Web developers usually daily change the user-agent to check the progress of their website's behavior in different browsers and devices.
For switching the user agent, you can rely on a browser extension or you can use the developer console to manually change the user agent that your browser will send with its HTTP requests.
Suppose you are using the Chrome browser but changed your user-agent to Internet Explorer 11. If the website only focuses on the user agent and perceives the browser to be IE 11. However, if the website performs the extra checking measures like it had WebRTC enabled. Then the website will detect the browser which supports WebRTC.
Therefore, with extra measures, you can detect the actual browser. But usually, the websites do not take the checking to that level.