>>201
You need to patch the file http-syntax.scm (and recompile mit-scheme). To quote the repo:
The file runtime/http-syntax.scm follows the RFC 2616 which requires that the value of the Location header be an absolute URI. The standard has been replaced (see RFC 7231 section 7.1.2.) and a relative URI is now allowed.
Recoding the redirection after posting would mean SchemeBBS not being domain agnostic. I know patching makes the install cumbersome, I'll try to get both patches incorporated in MIT Scheme 10, http-syntax and httpio (now http-io) because those two libraries have bugs and haven't changed (I just checked).
If you don't want to recompile MIT Scheme, there's a pre-compiled binary for x86_64 here: https://textboard.org/static/mit-scheme-9.2/