[Building a Gateway] not expected response with circuitBreaker

[vinsse2001]

In 2nd paragraph ("Using Spring Cloud CircuitBreaker"), after adding route for circuitBreaker, I don't have expected response.
Expected:

HTTP/1.1 504 Gateway Timeout
content-length: 0

Obtained:

>curl --dump-header - --header 'Host: www.circuitbreaker.com' http://localhost:8080/delay/3
curl: (6) Could not resolve host: www.circuitbreaker.com'
HTTP/1.1 404 Not Found
Content-Type: application/json
Content-Length: 136

{"timestamp":"2021-10-04T15:34:25.537+00:00","path":"/delay/3","status":404,"error":"Not Found","message":null,"requestId":"7668aa60-1"}

So I tried with complete code, I have same response (of course, with different tsp and id).
Is there some configuration missing?

For information, the curl command in first paragraph gives expected response:

>curl http://localhost:8080/get
{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Content-Length": "0",
    "Forwarded": "proto=http;host=\"localhost:8080\";for=\"0:0:0:0:0:0:0:1:58357\"",
    "Host": "httpbin.org",
    "Salut": "Toi ;)",
    "User-Agent": "curl/7.55.1",
    "X-Amzn-Trace-Id": "Root=1-615b1e8f-09519dd70684bfb6316288ec",
    "X-Forwarded-Host": "localhost:8080"
  },
  "origin": "0:0:0:0:0:0:0:1, 91.166.78.188",
  "url": "http://localhost:8080/get"
}