idrac "http server settings" for automatic firmware updates

i cant find any docs on this.. I am trying to use the firmware auto update feature.

I dont see how to set up this

(see attached)

when I put in the webserver.. it tries and then fails.. but what am I supposed to put in the document root?  i tried putting in firmimg.d7 and nothing happens..

the only docs I found are below.. but why does it only explain some of it and then direct me to
"see the iDRAC Online Help"   I dont know what that means.. 
does anyone have a working example of the idrac getting FW from a web server?

Updating device firmware using HTTP

1. In the iDRAC web interface, go to Overview > iDRAC Settings > Update and Rollback . The Firmware Update page is displayed.
2. On the Update tab, select HTTP as the File Location.
3. In the HTTP Server Settings section, enter the HTTP details. For information about the fields, see the iDRAC Online Help.