If you use Apache, probably you have used the mod_rewrite and the RewriteRule sentences.
One simple rewriting rule:
RewriteRule ^/cars http://myweb.com?productid=244 [L,R]
So, when I try to access to subfolder "cars" of the configured virtual host, the browser will be redirected to http://myweb.com?productid=244
But, what if the product id contains, for example, a character like '%'?Let's try:
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RewriteRule ^/cars http://myweb.com?productid=2%44