Will Anderson
62f4d56a62
Per RFC 9110 §9.3.2, HEAD must mirror GET headers + Content-Length
without sending a body. Existing http_worker / http_worker_v2 dropped
HEAD straight to the El handler, which had no idea what to do and
returned the catch-all 404 envelope. Link checkers and SEO bots saw
the 404 and reported the site as broken.
Fix layer is in the runtime, not the El handler:
* http_worker / http_worker_v2 detect HEAD before calling the
handler, dispatch as method="GET" so handler logic is unchanged,
record head_only in a thread-local, then call http_send_response.
* http_send_response reads the thread-local and skips the
final http_send_all of the body. Status line + headers +
Content-Length still go out in full.
Verified locally on engram /health: HEAD returns
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Content-Length: 48
Connection: close
(no body — curl reports size_download=0)
compiler.el: rename `target` → `tgt` in main(); the lexer reserves
`target` as a keyword, and the let-binding position requires Ident.
The naming convention was already followed elsewhere in the file
(compile_dispatch's parameter is tgt for exactly this reason); main
was an outlier that the existing Rust-genesis-built elc happened to
parse but bootstrap.py refused, blocking self-host.