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setYield(true) in last handler does not trigger 404 response #1164

Description

@VanillaMaster

version: v20.51.0
platform: Microsoft Windows NT 10.0.19045.0 x64

calling setYield breaks default handler
i can assume it is a bug or undocumented behavior
in both cases fix is required

example:

import { App } from "uWebSockets.js";

const app = App();
app.listen(8080, function(token) {
    if (!token) console.error(`Failed to start listening`)
})

request to example above results in the following response

> GET / HTTP/1.1
> Host: localhost:8080
> Accept: */*

< HTTP/1.1 404 File Not Found
< Date: Mon, 21 Apr 2025 13:28:41 GMT
< uWebSockets: 20
< Content-Length: 81

with body

<html><body><h1>File Not Found</h1><hr><i>uWebSockets/20 Server</i></body></html>

but when any listener that just yields attached

import { App } from "uWebSockets.js";

const app = App();
app.any("/*", function(res, req) {
    console.log(req.getMethod(), req.getUrl());
    req.setYield(true);
});
app.listen(8080, function(token) {
    if (!token) console.error(`Failed to start listening`)
})

same request fails

> GET / HTTP/1.1
> Host: localhost:8080
> Accept: */*

* Empty reply from server
* Closing connection 60

problem can be solved with attachment of explicit default handler

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