I am using Chrome in linux with Version 51.0.2704.63 (64-bit). I recorded a HTTP request of Chrome and here is part of the recording:
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.63 Safari/537.36
Why does Chrome send four browsers in the user-agent field? Is this a countermeasure to obfuscate the browser version?