It was never useful for IMAP, and NNTP hasn't needed it since:
1bf653ad139bf7bb (nntp+www: drop List-* and Archived-At headers, 2020-12-10)
---
lib/PublicInbox/IMAPD.pm | 1 -
lib/PublicInbox/NNTPD.pm | 1 -
2 files changed, 2 deletions(-)
diff --git a/lib/PublicInbox/IMAPD.pm b/lib/PublicInbox/IMAPD.pm
index ba6ad05d..78323e57 100644
--- a/lib/PublicInbox/IMAPD.pm
+++ b/lib/PublicInbox/IMAPD.pm
@@ -44,7 +44,6 @@ sub _refresh_ibx { # pi_cfg->each_inbox cb
PublicInbox::IMAP::ensure_slices_exist($imapd, $ibx);
# preload to avoid fragmentation:
$ibx->description;
- $ibx->base_url;
# ensure dummies are selectable:
do {
$dummies->{$ngname} = $dummy;
diff --git a/lib/PublicInbox/NNTPD.pm b/lib/PublicInbox/NNTPD.pm
index 4f550bb0..4401a29b 100644
--- a/lib/PublicInbox/NNTPD.pm
+++ b/lib/PublicInbox/NNTPD.pm
@@ -45,7 +45,6 @@ sub refresh_groups {
# only valid if msgmap and over works
# preload to avoid fragmentation:
$ibx->description;
- $ibx->base_url;
} else {
delete $groups->{$ngname};
# Note: don't be tempted to delete more for memory
