{* ../../docs_src/advanced_middleware/tutorial001.py hl[2,6] *}

## `TrustedHostMiddleware`

Enforces that all incoming requests have a correctly set `Host` header, in order to guard against HTTP Host Header attacks.

{* ../../docs_src/advanced_middleware/tutorial002.py hl[2,6:8] *}

The following arguments are supported:

        ```Python
        import uvicorn.workers.UvicornWorker
        ```

* `--bind`: 👉 💬 🐁 📢 & ⛴ 👂, ⚙️ ❤ (`:`) 🎏 📢 & ⛴.
    * 🚥 👆 🏃‍♂ Uvicorn 🔗, ↩️ `--bind 0.0.0.0:80` (🐁 🎛) 👆 🔜 ⚙️ `--host 0.0.0.0` & `--port 80`.

🔢, 👆 💪 👀 👈 ⚫️ 🎦 **🕹** (🛠️ 🆔) 🔠 🛠️ (⚫️ 🔢).

👆 💪 👀 👈:

* 🐁 **🛠️ 👨‍💼** ▶️ ⏮️ 🕹 `19499` (👆 💼 ⚫️ 🔜 🎏 🔢).
* ⤴️ ⚫️ ▶️ `Listening at: http://0.0.0.0:80`.

		store:      queueStore,
		cancel:     cancel,
		cancelCh:   ctx.Done(),
	}

	// Calculate the webhook addr with the port number format
	target.addr = args.Endpoint.Host
	if _, _, err := net.SplitHostPort(args.Endpoint.Host); err != nil && strings.Contains(err.Error(), "missing port in address") {
		switch strings.ToLower(args.Endpoint.Scheme) {
		case "http":
			target.addr += ":80"
		case "https":

        } else {
            value = urlStr;
        }
        try {
            final URL url = new java.net.URL(value);
            final String host = url.getHost();
            if (StringUtil.isBlank(host) || "http".equalsIgnoreCase(host) || "https".equalsIgnoreCase(host)) {
                return false;
            }
        } catch (final MalformedURLException e) {
            return false;
        }

		tokens := strings.SplitN(arg, "=", 2)
		if len(tokens) != 2 {
			logger.Fatal(fmt.Errorf("invalid arguments passed to --ftp=%s", arg), "unable to start FTP server")
		}
		switch tokens[0] {
		case "address":
			host, portStr, err := net.SplitHostPort(tokens[1])
			if err != nil {
				logger.Fatal(fmt.Errorf("invalid arguments passed to --ftp=%s (%v)", arg, err), "unable to start FTP server")
			}
			port, err = strconv.Atoi(portStr)

/**
 * Android implementation of CertificateChainCleaner using direct Android API calls.
 * Not used if X509TrustManager doesn't implement [X509TrustManager.checkServerTrusted] with
 * an additional host param.
 */
internal class AndroidCertificateChainCleaner(
  private val trustManager: X509TrustManager,
  private val x509TrustManagerExtensions: X509TrustManagerExtensions,
) : CertificateChainCleaner() {

### Remotely Inspecting backend data

 * the client and may be necessary for proper operation.
 * <p>
 * This class should be used in favor of <tt>InetAddress</tt> to resolve
 * hostnames on LANs and WANs that support a mixture of NetBIOS/WINS and
 * DNS resolvable hosts.
 */

public class UniAddress implements Address {

    /**
     * Check whether a hostname is actually an ip address
     * 
     * @param hostname
     * @return whether this is an IP address
     */

なので、以下:

```Python
    uvicorn.run(app, host="0.0.0.0", port=8000)
```

は実行されます。

---

そのモジュール (ファイル) をインポートした場合は、こうはなりません。

したがって、次のようなもう一つのファイル `importer.py` がある場合:

```Python
from myapp import app

# Some more code
```

`myapp.py` 内の自動変数には、値が `"__main __"` の変数 `__name__` はありません。

したがって、以下の行:

```Python
    uvicorn.run(app, host="0.0.0.0", port=8000)
```

は実行されません。

     * @param origin when present, the [origin](http://tools.ietf.org/html/rfc6454) is typically
     *     represented as a combination of scheme, host and port. When empty, the origin is that of
     *     the `streamId`.
     * @param protocol an ALPN protocol, such as `h2`.
     * @param host an IP address or hostname.
     * @param port the IP port associated with the service.