i'm getting re-acquainted with OpenPGP and noticed that GnuPG allows me to store a "preferred keyserver" URL in my keys:
reuben@localhost:~$ gpg2 --edit-key 'Reuben NP Garrett <firstname.lastname@example.org>' gpg> help .. keyserver set the preferred keyserver URL for the selected user IDs
this seems to influence GPG's 'refresh-keys' operation, since when i tried setting this value to http://pgp.mit.edu/ (where i'd previously published my keys), GPG complained of "no key data found for http://pgp.mit.edu/". however, when the keyserver URL was set to an unreachable value (https://pgp.mit.edu/), GPG instead complained that it "couldn't connect to host" and failed over to keys.gnupg.net (as a built-in server, i suspect).
is the "preferred keyserver" URL supposed to directly target my key, e.g. http://pgp.mit.edu/pks/lookup?op=vindex&search=0x0B17E17AADF01139? or what is a "correct" (or useful/meaningful) way to set this property?