XML Parsing Error
When you attempt to visit a particular website, you get the yellow error page with an error like this:
XML Parsing Error: syntax error Location: http://example.com/ Line Number 1, Column 1:<!doctype html> ^
In an error like this, an XML parsing error has been indicated for content that is clearly not XML. (It is an html5 document in the above example, but could be other kinds of documents as well.) This error indicates that the page is being served with an incorrect content-type header. If the page works fine in other browsers, the website is probably using browser-sniffing incorrectly. You can try changing your user-agent string to disguise your Conkeror as another browser. If this is determined to be the source of the problem, we recommend that you report the problem to the webmaster of the site in question, so that it has a chance of being fixed for everybody. Another way to work around an error like this is to use the view-as-mime-type command (bound to v) and enter the correct content-type at the prompt, like "text/html".