> Despite that, I tried to compress the nar with bzip2 just for fun, but I
> ran into another problem:
>
>   warning: call to primitive-fork while multiple threads are running;
>            further behavior unspecified.  See "Processes" in the
>            manual, for more information.
>
> I'm running a REPL server in addition to the web server, but I imagine
> the web server also spawns additional threads to handle requests, so
> either way 'filtered-output-port' won't work here.

(web server http) does not use threads so it should be OK.  But we’ll
see that afterwards.  :-)

Thanks,
Ludo’.