+ if ($env && $self->{cmd}) {
+ log_err($env, join(' ', @{$self->{cmd}}) . ": $err");
+ }
+ }
+ if ($qx_cb) {
+ eval { $qx_cb->($qx_buf, $qx_arg) };
+ } elsif (my $wcb = delete $env->{'qspawn.wcb'}) {
+ # have we started writing, yet?
+ require PublicInbox::WwwStatic;
+ $wcb->(PublicInbox::WwwStatic::r(500));