There has been a change made to the httpd.conf file in 2.4.3 when it comes out. I am posting this because most people when upgrading do not rewrite their conf files from the ones included in our packages.
The change is simple, add this to the bottom of your httpd.conf file;
# Deal with user agents that deliberately violate open standards
#
<IfModule setenvif_module>
BrowserMatch "MSIE 10.0;" bad_DNT
</IfModule>
<IfModule headers_module>
RequestHeader unset DNT env=bad_DNT
</IfModule>
There is currently discussion of whether this was a good thing to add to the default config. It basically subverts the DNT (Do Not Track) setting in IE10. There are people screaming about this, there's been some bad media about this and I see no reason to actually add it to my existing config.
It's in the config in 2.4.3 downloaded from here, if you want to remove it, do it.
Even if browsers sends that signal. I don't know an application that cares about that yet.