fix: don't use external URL in test

test/issue-3136.js

@@ -1,9 +1,21 @@
 const { request } = require('..')
+const { test, after } = require('node:test')
+const net = require('node:net')
+const { once } = require('node:events')
+const assert = require('node:assert')
 
-request('http://www.rolbox.it/rk-kastelruth/webcam/web03.jpg', { throwOnError: true })
-  .then(({ statusCode, body }) => {
-    console.log('then called', { statusCode })
-    body.on('err', e => console.error('body error:', e))
+test('https://github.com/nodejs/undici/issues/3136', async (t) => {
+  const server = net.createServer((socket) => {
+    socket.write('HTTP/1.1 404 Not Found\r\n')
+    socket.write('Transfer-Encoding: chunked\r\n\r\n')
+    socket.write('\r\n')
   })
-  .catch(e => console.error('catch called:', e))
-  .finally(() => console.log('finally called'))
+  after(() => server.close())
+  server.listen(0)
+  await once(server, 'listening')
+  await assert.rejects(
+    request(`http://localhost:${server.address().port}`, {
+      throwOnError: true
+    })
+  )
+})