As only one process can be listening on this port, the process that would do it would be the **TLS Termination Proxy**.

The TLS Termination Proxy would have access to one or more **TLS certificates** (HTTPS certificates).

Using the **SNI extension** discussed above, the TLS Termination Proxy would check which of the TLS (HTTPS) certificates available it should use for this connection, using the one that matches the domain expected by the client.

TLS 终止代理可以访问一个或多个 **TLS 证书**（HTTPS 证书）。

使用上面讨论的 **SNI 扩展**，TLS 终止代理将检查应该用于此连接的可用 TLS (HTTPS) 证书，并使用与客户端期望的域名相匹配的证书。

在这种情况下，它将使用`someapp.example.com`的证书。

<img src="/img/deployment/https/https03.svg">

客户端已经**信任**生成该 TLS 证书的实体（在本例中为 Let's Encrypt，但我们稍后会看到），因此它可以**验证**该证书是否有效。

然后，通过使用证书，客户端和 TLS 终止代理 **决定如何加密** **TCP 通信** 的其余部分。 这就完成了 **TLS 握手** 部分。

	public static final field TLS_AES_128_CCM_8_SHA256 Lokhttp3/CipherSuite;
	public static final field TLS_AES_128_CCM_SHA256 Lokhttp3/CipherSuite;
	public static final field TLS_AES_128_GCM_SHA256 Lokhttp3/CipherSuite;
	public static final field TLS_AES_256_GCM_SHA384 Lokhttp3/CipherSuite;
	public static final field TLS_CHACHA20_POLY1305_SHA256 Lokhttp3/CipherSuite;

	tlsConfig, err := saramatls.NewConfig(args.TLS.ClientTLSCert, args.TLS.ClientTLSKey)
	if err != nil {
		target.loggerOnce(context.Background(), err, target.ID().String())
		return err
	}

	config.Net.TLS.Enable = args.TLS.Enable
	config.Net.TLS.Config = tlsConfig
	config.Net.TLS.Config.InsecureSkipVerify = args.TLS.SkipVerify
	config.Net.TLS.Config.ClientAuth = args.TLS.ClientAuth

        // TLSv1.3.
        CipherSuite.TLS_AES_128_GCM_SHA256,
        CipherSuite.TLS_AES_256_GCM_SHA384,
        CipherSuite.TLS_CHACHA20_POLY1305_SHA256,
        // TLSv1.0, TLSv1.1, TLSv1.2.
        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
        CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
        CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,

TLS_AES_128_GCM_SHA256
TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_256_GCM_SHA384

TLS_AES_128_GCM_SHA256
TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256
TLS_AES_128_CCM_SHA256
TLS_AES_256_CCM_8_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA

<img src="/img/deployment/https/https02.svg">

Diese Interaktion zwischen dem Client und dem Server zum Aufbau der TLS-Verbindung wird als **<abbr title="TLS-Handschlag">TLS-Handshake</abbr>** bezeichnet.

### TLS mit SNI-Erweiterung

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_256_GCM_SHA384

      "plan 0 cancel",
      "plan 1 TLS connecting...",
      "plan 1 TLS connected",
      "plan 2 TCP connecting...",
    )

    taskFaker.advanceUntil(270.ms)
    assertEvents(
      "plan 0 TCP connect canceled",
    )

    taskFaker.advanceUntil(280.ms)
    assertEvents(
      "plan 2 TCP connected",
      "plan 2 TLS connecting...",
      "plan 2 TLS connected",
    )