Data about your computer is sent to the web server via a user agent. The agent sends all types of information, but none of it is personally identifiable information (PII). When a user requests a web page with a browser, the browser transmits information about the user’s computer operating system as well as information about the browser itself.


If you want to check out the data that your web browser has in the user-agent, there are various website that can provide you this information. This website

Here are a few examples from various browsers:
Mozilla/5.0 (BlackBerry; U; BlackBerry 9900; en) AppleWebKit/534.11+ (KHTML, like Gecko) Version/ Mobile Safari/534.11+

Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; HTC_IncredibleS_S710e Build/GRJ90) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1

Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543 Safari/419.3

Internet Explorer 9.0
Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0)

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0

If your curious or get bored, this link briefly goes over the different protocols used by web browsers.


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