351 2003-09-29 17:38:42 +0000 valid http headers cause IO error 2006-03-05 12:49:33 +0000 1 1 1 Unclassified CSSValidator media type CSS Validator PC Linux RESOLVED DUPLICATE 232 http://simple.be/test/valid/pfile P2 critical --- 1 open plh r_arigur oldest_to_newest 784 0 open 2003-09-29 17:38:42 +0000 The lack of ".php" in this URI adds three HTTP response headers: Content-Location: pfloats.php Vary: negotiate TCN: choice This causes the following error message from the CSS Validator: I/O Error: http://simple.be/test/valid/pfile: Not Acceptable The XHTML 1.1 validates, and other (.html) variations of the URI (with the exact same XHTML/CSS files) pass CSS validation. I have not narrowed it down to exactly which HTTP header causes the error. I'm hoping you that I have provided enough info. Links to all 4 URL combinations are at the listed URL. Thanks, Brett Hamilton 785 1 open 2003-09-29 17:45:21 +0000 Corrections: These three HTTP headers: Content-Location: pfile.php Vary: negotiate TCN: choice and I intended to specify Component: "media type" 808 2 r_arigur 2003-10-16 12:12:48 +0000 The problem is actually slightly different from what you describe; your webserver is behaving inappropriately. See Bug 232 for more information. *** This bug has been marked as a duplicate of 232 ***