strange inability to re-direct to PHP page

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This Dreamhost support thread was started by cybohemia on 2009-07-25 12:11:14:

Post Reply? A short while ago, web site I’m developing suddenly started to give me “404 Not Found” errors when it goes to PHP pages…but only for the first time it tries to go to that page. When I refresh the browser (Internet Explorer), the page loads fine so the page is actually there, just not getting served with the first request. I tried it in Firefox and I see a stray <Br> character at the end of the URL. When I delete the trailing <Br> things work. I’m not sure why the trailing <Br> is getting inserted. It’s very strange and any thoughts and help would be greatly appreciated!

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