The W3C validator started showing this error message after I started serving my XHTML 1.1 pages via
I'm not actually crashing the validator, but for some reason it does not like validating my website now. Apparently, the switch to
application/xhtml+xml is causing a much-unwanted side-effect. The CSS "jigsaw" validator doesn't seem to have this same problem.
I did switch back to
text/html temporarily, and the W3C validator found my site and validated it. Then, as soon as I switch to the correct MIME type, the Error 500 message reappears.
I checked other browsers to see if they had problems with my site. They all served it up as they should (NS4 unstyled, but the site was shown.)
Does anyone have any ideas why a simple change such as this...
Content.Type = "application/xhtml+xml";
...would cause an error in the W3C validator? I only send via that MIME type when the Request object's Content.AcceptTypes array includes
application/xhtml+xml as an acceptable MIME.
And the reference in the error message to DNS -- what's with that? Does
application/xhtml+xml expose DNS problems?
Something's definately wrong on my end because scores of other XHTML 1.1 sites are sending the correct MIME without any validator hiccups. I'm just at a loss as to where to begin to look.