For message_hook/3 when clicking 
received
Forbidden
You don’t have permission to access /scratch/swipl/src/plweb/pack/mirror/87/88/8788cc8528bcb5b102b4a99662d0bbc1b1be4dff/prolog/lsp_checking.pl on this server
Don’t know if this is a transient error or something else so just reporting.