why a website can use two different webserver to host their website

Hi, all experts here.

I used builtwith.com to analyse a website's technology. Let's say "kornferry.com", it show two web servers are being used now. Apache 2.2 and IIS 6. How could they use two different web server to host website?

Also the framwork includes J2EE and PHP and ASP.NET, as far as I know, these frameworks are different technology for different platforms, why can they use a mix?

Jason YuAsked:
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Jason C. LevineDon't talk to me.Commented:
BuiltWith is not exactly 100% accurate.

It reads the headers the server sends out in response to requests, looks for patterns in the site code sent to the browser, and reports false positives All. The. Time.  All you have to do is configure your server to be a little bit misleading to throw off BuiltWith and similar services and make it harder for people to figure out what you are doing.

That being said, if a site is using lots of iframes and external content calls, it can generate results like what you see as BuiltWith goes down the rabbit holes trying to figure everything out.

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Dave BaldwinFixer of ProblemsCommented:
It's saying that because one of their mail servers is on Outlook.com, a Microsoft site which may be hosting Exchange for them.  Their web server is Redhat Linux.
Jason YuAuthor Commented:
Thank you for the answers.

I believe websever is on rhel.
Anthony CarterCommented:
How to do it with IIS: http://blogs.technet.com/b/stefan_gossner/archive/2008/03/12/iis-7-how-to-send-a-custom-server-http-header.aspx

How to do it with Apache:

Use mod_headers
Header set Server "New Server Name Goes Here"

I can report my server to give you anything I want.

Of course, the software might be just following permanent redirects, one to an IIS and one to an Apache based server.
Dave BaldwinFixer of ProblemsCommented:
Yes, 'rhel' = RedHat Enterprise Linux.
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