It's a holiday weekend in the US, as as we prepare for the 4th of July, we have some query strings that are worth understanding. (original)--Remy

As Stephen A.'s client was walking him through their ASP.NET site, Stephen noticed a rather odd URL scheme. Instead of using the standard Query String -- i.e., http://their.site/Products/?ID=2 -- theirs used some form of URL-rewriting utilizing the "@" symbol in the request name: http://their.site/Products/@ID=2.aspx. Not being an expert on Search Engine Optimization, Stephan had just assumed it had something to do with that.

A few weeks later, when Stephan finally had a chance to take a look at the code, he noticed something rather different...

That's right; every "dynamic-looking" page was, in fact, static. It was going to be a long maintenance contract...

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https://thedailywtf.com/articles/classic-wtf-when-the-query-string-is-just-not-enough