: Is some version of IE9 lowercasing URLs? I have some pages that require a case sensitive input in the URL. Like /page/MT with 'MT' being the param. I've noticed lots of error reports lately

@Lengel546

That UA string suggests it isn't Internet Explorer at all, supporting ionFish's theory that it's a bot.

Windows NT 9.0 gives it away. Even Windows 8 only calls itself Windows NT 6.2. It also makes no reference to Trident, IE's rendering engine.

It should be more like Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0). See blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx

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@Ravi8258870

Checking the IE9 website, this is the ONLY thing relating to URL case.

400 BAD FILE REQUEST: This error occurs due to input of incorrect URL by the user, like we unknowingly use uppercase letters while specifying a URL rather than lower case letters and sometimes use of incorrect punctuation causes this error.

I do have a hunch though: since they're all the same user agent, and different IPs, someone could be using bots to send automated requests to your pages. The bots wouldn't actually use IE9, they just do simple requests and therefore ignore the case, and send IE9 as their user-agent. The referrers could also easily be spoofed to previous pages on the site.

Perform a few lookups on the IP addresses, and see if they lead to residential networks or hosted servers (usually by having a hosting company as the reverse host). This is NOT a definite way to check, because many many home computers are infected with viruses, which are also physically capable of doing that.

Is it possible NOT to use case-sensitive URLs? That would be a better solution.

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