fix(request): add AbortSignal to toWebRequest for client disconnect detection

[LeSingh1]

Summary

Closes #1204

Problem

toWebRequest creates a new Request() without an AbortSignal. This means downstream code that consumes request.signal (e.g. tRPC subscriptions, streaming handlers) can never detect when a client disconnects — the signal stays open forever.

Fix

When falling through to new Request(...), create an AbortController, wire its .abort() to event.node.req.on("close", ...), and pass signal: controller.signal to the Request constructor.

// Before
export function toWebRequest(event: H3Event) {
  return (
    event.web?.request ||
    new Request(getRequestURL(event), {
      duplex: "half",
      method: event.method,
      headers: event.headers,
      body: getRequestWebStream(event),
    })
  );
}

// After
export function toWebRequest(event: H3Event) {
  if (event.web?.request) {
    return event.web.request;
  }
  const controller = new AbortController();
  event.node.req.on("close", () => controller.abort());
  return new Request(getRequestURL(event), {
    duplex: "half",
    method: event.method,
    headers: event.headers,
    body: getRequestWebStream(event),
    signal: controller.signal,
  });
}

When event.web?.request is already present (i.e. a native web runtime), it carries its own signal — we return it as-is and skip the AbortController entirely.

Related

• Issue: toWebRequest is not creating abort signal #1204
• Workaround mentioned in issue: AbortSignal not working in subscriptions wobsoriano/trpc-nuxt#191

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