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3 Determining<br />
A Responsive eLearning Design Strategy<br />
3.3: Challenges and Solutions<br />
3.3.2: Development<br />
The Tale of User Agents: All software applications, including browsers, contain <strong>us</strong>er agents that send<br />
information to the network about themselves as well as the device they run on. This information is<br />
provided in the form of a unique <strong>us</strong>er-agent string specifying the software application type, name, revision<br />
and the operating system.<br />
If you take close look at these strings, you'll see that the browser name is different for different devices<br />
—the Chrome <strong>us</strong>er agent for the desktop returns "Chrome" as the browser name whereas the <strong>us</strong>er agent<br />
for the iPhone returns “CriOS” ("Cr" for Chrome and "iOS" for the OS). Similarly, there can be other<br />
parameter values <strong>with</strong>in <strong>us</strong>er-agent strings that differ based on device-software application combinations.<br />
Sample <strong>us</strong>er-agent string for Google Chrome 32 on a Windows 7 Desktop PC<br />
Sample <strong>us</strong>er-agent string for Google Chrome 31 on an iPhone running iOS 6<br />
Sample <strong>us</strong>er-agent string for Google Chrome running on a Nex<strong>us</strong> 5 is<br />
Sample <strong>us</strong>er-agent string for Firefox running on the same Nex<strong>us</strong> 5 is<br />
Here, you can see that unlike for Chrome, the <strong>us</strong>er-agent string for Firefox does not specify the Android version.<br />
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