index($dst, "\n") >= 0 and die "`\\n' not allowed in `$dst'";
# n.b. this is still a truckload of code...
-require URI;
require PublicInbox::LEI;
require PublicInbox::LeiExternal;
require PublicInbox::LeiMirror;
-require PublicInbox::LeiCurl;
-require PublicInbox::Lock;
$url = PublicInbox::LeiExternal::ext_canonicalize($url);
my $lei = bless {