Example:

```sh

            "retry_host_predicate": [
             {
              "name": "envoy.retry_host_predicates.previous_hosts",
              "typed_config": {
               "@type": "type.googleapis.com/envoy.extensions.retry.host.previous_hosts.v3.PreviousHostsPredicate"
              }
             }
            ],
            "host_selection_retry_max_attempts": "5",
            "retriable_status_codes": [
             503
            ]

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# Gradle runtimes

Gradle is made up of the following processes that work together to "run the build":

- Gradle daemon. This is the process that actually runs the build. It hosts build logic and coordinates the lifecycle of the build. It is a long-running daemon process.
- CLI client. This is the `gradle` or `gradlew` command, and is responsible for locating, starting and interacting with the Gradle daemon, potentially downloading the Gradle distribution. 

 *
 * By orchestrating two different servers with the same port but different IP addresses, we can
 * test what OkHttp does when both are reachable, or if only one is reachable.
 *
 * This test only runs on host machines that have both IPv4 and IPv6 addresses for localhost.
 */
@Timeout(30)
class FastFallbackTest {
  @RegisterExtension
  val clientTestRule = OkHttpClientTestRule()

> Host: localhost:9000
> User-Agent: curl/7.81.0
> Accept: */*
>

// by sending a naked HTTP request with liveness checks.
func isServerResolvable(endpoint Endpoint, timeout time.Duration) error {
	serverURL := &url.URL{
		Scheme: endpoint.Scheme,
		Host:   endpoint.Host,
		Path:   pathJoin(healthCheckPathPrefix, healthCheckLivenessPath),
	}

	httpClient := &http.Client{
		Transport: globalInternodeTransport,
	}

			} else if len(ingress.Spec.ExternalIPs) > 0 {
				ingressIP = ingress.Spec.ExternalIPs[0]
			}
			// TODO: add case where the load balancer is a DNS name
		}
	}

	var hosts string
	if netutil.IsValidIPAddress(ingressIP) {
		hosts = fmt.Sprintf("%s %s\n", ingressIP, IstiodHost(istioNamespace, revision))
	} else {

	if ok {
		return rt
	}
	return nil
}

// Returns a minio-go Client configured to access remote host described by destDNSRecord
// Applicable only in a federated deployment
var getRemoteInstanceClient = func(r *http.Request, host string) (*miniogo.Core, error) {
	cred := getReqAccessCred(r, globalSite.Region())
	// In a federated deployment, all the instances share config files

🙆 📨 📨 `http` ⚖️ `ws` 🔜 ❎ 🔐 ⚖ ↩️.

```Python hl_lines="2  6"
{!../../docs_src/advanced_middleware/tutorial001.py!}
```

## `TrustedHostMiddleware`

🛠️ 👈 🌐 📨 📨 ✔️ ☑ ⚒ `Host` 🎚, ✔ 💂‍♂ 🛡 🇺🇸🔍 🦠 🎚 👊.

```Python hl_lines="2  6-8"
{!../../docs_src/advanced_middleware/tutorial002.py!}
```

📄 ❌ 🐕‍🦺: