To make a long story short, I have dynamic pages on a website that display reviews. If there are no reviews associated with a particular city/county/area/etc the mysql query
Trying redirecting using a 307 or 301 with a location header
Your problem has nothing to do with what you include: It's that your page is too small.
In my experience, Chrome's built-in "Oops" page is displayed, like the one in Internet Explorer, when the page emits only the 404 header and less than a defined number of bytes of content (I think it's 512 bytes in IE, don't know the limit in Chrome).
I tend to pad my 404 pages with a few hundred bytes of meaningless content wrapped in HTML comments to make sure the custom 404 page is displayed.
Or of course, use the opportunity for some cool ASCII Art!
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$"""""$ooooo ooooo$$$$$$$ o$" o"
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oo$ oooo$$$$$$$$$$$"""""$$$$" o$" o$"
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