Panic in new HTTP server

[lucacasonato]

============================================================
Deno has panicked. This is a bug in Deno. Please report this
at https://github.com/denoland/deno/issues/new.
If you can reliably reproduce this panic, include the
reproduction steps and re-run with the RUST_BACKTRACE=1 env
var set and include the backtrace in your report.

Platform: macos aarch64
Version: 1.33.3
Args: ["/Users/lucacasonato/.deno/bin/deno", "run", "-A", "--unstable", "--watch", "main.ts"]

thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', ext/http/http_next.rs:196:1
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I was just refreshing somewhat quickly - not quite sure what caused it.

[lucacasonato]

with_req should handle invalid (already closed) req ids correctly (gracefully error) instead of panicing.

[bartlomieju]

Does it actually happen on v1.33.4? I think a22388b might have already fixed that problem.

[mmastrac]

I am pretty sure this is fixed by a22388b. Refreshing quickly was causing a request to get dropped, which removed it from the slab before we could complete it. There's a test for this particular failure in there now that was failing before and I'm unable to repro after.

[mmastrac]

Mostly likely a dupe of #19058 -- will close for now.