History of the browser user-agent string--转
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https://webaim.org/blog/user-agent-string-history/ In the beginning there was?,and Mosaic called itself?NCSA_Mosaic/2.0 (Windows 3.1),and Mosaic displayed pictures along with text,and there was much rejoicing.
And Netscape said,let us make fun of Microsoft and refer to Windows as “poorly debugged device drivers,” and Microsoft was angry. And so Microsoft made their own web browser,which they called Internet Explorer,hoping for it to be a “Netscape Killer”.?
And Microsoft sold IE with Windows,and made it better than Netscape,and the first browser war raged upon the face of the land. ?
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And Gecko was good,and IE was not,and sniffing was reborn,and Gecko was given good web code,and other browsers were not.?
And Microsoft feared Firefox greatly,and Internet Explorer returned,and called itself?Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)?and it rendered good code,but only if webmasters commanded it to do so.
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,being short for “Mosaic Killer,” but Mosaic was not amused,so the public name was changed to Netscape,and Netscape called itself?Mozilla/1.0 (Win3.1),and there was more rejoicing. And Netscape supported frames,and frames became popular among the people,but Mosaic did not support frames,and so came “user agent sniffing” and to “Mozilla” webmasters sent frames,but to other browsers they sent not frames.
,and Chrome used Webkit,and it was like Safari,and wanted pages built for Safari,and so pretended to be Safari. And thus Chrome used WebKit,and pretended to be Safari,and WebKit pretended to be KHTML,and KHTML pretended to be Gecko,and all browsers pretended to be Mozilla,and Chrome called itself?Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML,like Gecko) Chrome/0.2.149.27 Safari/525.13,and the user agent string was a complete mess,and near useless,and everyone pretended to be everyone else,and confusion abounded.