"-$$-".sprintf('%x', int(rand(0xffffffff)));
my $nwr = PublicInbox::NetWriter->new;
chop($imap_url) if substr($imap_url, -1) eq '/';
"-$$-".sprintf('%x', int(rand(0xffffffff)));
my $nwr = PublicInbox::NetWriter->new;
chop($imap_url) if substr($imap_url, -1) eq '/';