gistfile1.txt

The way this works is that:

    *

      if the URL is missing a protocol, http is assumed,
    *

      if the hostname section contains no periods, it has the domain derived from DHCP appended to it, and
    *

      if there's no /'s after the hostname, then the default path is added.

In addition to specifying the url, you can also specify settings that do not directly affect the behavior of debian-installer itself, but can be passed through to scripts specified using preseed/run in the loaded preseed file. At present, the only example of this is auto-install/classes, which has an alias classes. This can be used thus:

auto url=example.com classes=class_A;class_B