When I check pages for broken links using Xenu's Link Sleuth it usefully lists information about the web server, OS and PHP version
e.g.
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8j PHP5.2.9
Is there a simple way to extract similar information from the browser when viewing a page e.g. by a Javascript snippet/bookmarklet?
Update
The server information is part of the HTTP response header which is not accessible to Javascript. So a Javascript/bookmarklet solution would not be directly possible (though it could do something like sending the page URL to a site like Arjan's below).