`wasi::http::outgoing_handler::handle` crashes `wasmtime` instead of returning an error

[kaivol]

Test Case

Call wasi::http::outgoing_handler::handle with an invalid argument (e.g., path_with_query not set):

use wasi::http::outgoing_handler::{handle, OutgoingRequest};
use wasi::http::types::{Fields, Method, Scheme};

fn main() {
    let fields = Fields::new();
    let req = OutgoingRequest::new(fields);
    req.set_method(&Method::Get).unwrap();
    req.set_scheme(Some(&Scheme::Https)).unwrap();
    req.set_authority(Some("example.com")).unwrap();
    // Don't set path/query
    // req.set_path_with_query(Some("/")).unwrap(); 

    let res = handle(req, None);
    println!("{res:?}");
}

Steps to Reproduce

• Compile the example into a WASM component
• Run using wasmtime -W component-model -S http=true

Expected Results

handle should return an error, which then gets printed by the WASM component.

Actual Results

handle crashes the wasmtime runtime immediately, and the component code doesn't get a chance to handle the error:

Error: failed to run main module `.\target\wasm32-wasi\debug\wasmtime_demo.wasm`

Caused by:
    0: failed to invoke `run` function
    1: error while executing at wasm backtrace:
           0: 0x291982 - wit-component:shim!indirect-wasi:http/outgoing-handler@0.2.0-handle
           1: 0x5c27 - <unknown>!wasi::bindings::wasi::http::outgoing_handler::handle::h243762d529a071e2
           2: 0x2287 - <unknown>!wasmtime_demo::main::h6a3dfdd89fcbbb62
           3: 0x1e9a - <unknown>!core::ops::function::FnOnce::call_once::hef7075ed4fc37c5f
           4: 0x18ff - <unknown>!std::sys_common::backtrace::__rust_begin_short_backtrace::ha7ad02d581d2e631
           5: 0x1878 - <unknown>!std::rt::lang_start::{{closure}}::h298ac82840374e7e
           6: 0xf239 - <unknown>!std::rt::lang_start_internal::h11043ae9961d0df9
           7: 0x1814 - <unknown>!std::rt::lang_start::ha68b6582d347d4c9
           8: 0x2384 - <unknown>!__main_void
           9: 0x16d6 - <unknown>!_start
          10: 0x28dae9 - wit-component:adapter:wasi_snapshot_preview1!wasi:cli/run@0.2.0#run
       note: using the `WASMTIME_BACKTRACE_DETAILS=1` environment variable may show more debugging information
    2: ErrorCode::HttpProtocolError

Versions and Environment

Wasmtime version or commit: 19.0.0

Operating system: Windows 11

Architecture: x64