![]() ![]() ![]() If your website does this, odds are good your site will end up sending an error message instead of web pages to a version 100 web browsers. For example, while it's been known for decades that using UAs to determine what web pages or services should be served to a specific browser is a bad idea, that's never stopped all too many web developers from misusing them anyway. Some of these problems will escape their efforts. ![]() ![]() Both are working on finding and fixing the headaches. Google and Mozilla are well aware of these coming browser UA problems. We can expect all this and more as Chrome and Firefox 100 arrive. For instance, Opera 10 wouldn't render sites correctly back in 2009 and some sites wouldn't render at all with Firefox 10 because their scripts read Firefox 10 as the out-of-date Firefox 1.0. You see, we've already had a sneak preview of this problem when we went from 1-figure UAs (1-9) to 10-figure UAs. Yes, it's that simple.īut, while it may be simple, it doesn't mean that it's inconsequential. This time around our problem is that too many website programs can't deal with three-figure UAs. Then, the problem was that most programs of the late 90s and earlier couldn't deal with four-figure year dates. The most famous example is the still not quite dead yet Y2K problem. So, what's the problem here? It's an ancient one: Date format misconfigurations. The UA's format is:Īs this written typical examples of the latest release versions of browsers UAs are:Ĭhrome: Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.54 Safari/537.36įirefox: Mozilla/5.0 (Macintosh Intel Mac OS X 10.15 rv:96.0) Gecko/20100101 Firefox/96.0 Web developers use the UA in all kinds of ways with their server-side programs. JavaScript also uses it with the JavaScript erAgent. This is a string that browsers send in HTTP headers, so servers can identify the browser. The best crypto credit cards: Get your rewards in cryptocurrencyĪll web browsers come with a User-Agent (UA).YubiKeys: Our favorite security keys are must-haves.The best iPhone: Which model is right for you?.Free tax software: The top picks compared.White House: Brace for potential Russian cyberattacksĤ1 impressive questions to ask in a job interview ![]()
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