* Il existe une extension du protocole TLS (celui qui gère le cryptage au niveau TCP, avant HTTP) appelée <a
  href="https://fr.wikipedia.org/wiki/Server_Name_Indication" class="external-link" target="_blank"><abbr
  title="Server Name Indication (indication du nom du serveur)">SNI (indication du nom du serveur)</abbr></a>.

    * Ganz gleich, wie groß Ihr Server ist oder wie klein die einzelnen Anwendungen darauf sind.
    * Hierfür gibt es jedoch eine **Lösung**.
* Es gibt eine **Erweiterung** zum **TLS**-Protokoll (dasjenige, das die Verschlüsselung auf TCP-Ebene, vor HTTP, verwaltet) namens **<a href="https://en.wikipedia.org/wiki/Server_Name_Indication" class="external-link" target="_blank"><abbr title="Server Name Indication – Angabe des Servernamens">SNI</abbr></a>**.

    * No entanto, existe uma solução para isso.
* Há uma extensão para o protocolo TLS (aquele que lida com a criptografia no nível TCP, antes do HTTP) chamado <a href="https://en.wikipedia.org/wiki/Server_Name_Indication" class="external-link" target="_blank"><abbr title="Server Name Indication">SNI</abbr></a>.
    * Esta extensão SNI permite que um único servidor (com um único endereço IP) tenha vários certificados HTTPS e atenda a vários domínios / aplicativos HTTPS.

You would probably get a cloud server (a virtual machine) or something similar, and it would have a <abbr title="That doesn't change">fixed</abbr> **public IP address**.

In the DNS server(s) you would configure a record (an "`A record`") to point **your domain** to the public **IP address of your server**.

depends on the JVM or Android version, OkHttp version, and web server configuration. If there is no
common cipher suite and TLS version, your call will fail like this:

```
Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x7f2719a89e80:
    Failure in SSL library, usually a protocol error
        error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake

* **默认情况下**，这意味着你**每个 IP 地址只能拥有一个 HTTPS 证书**。
     * 无论你的服务器有多大，或者服务器上的每个应用程序有多小。
     * 不过，对此有一个**解决方案**。
* **TLS** 协议（在 HTTP 之下的TCP 层处理加密的协议）有一个**扩展**，称为 **<a href="https://en.wikipedia.org/wiki/Server_Name_Indication" class="external-link" target="_blank"><abbr title="服务器名称指示">SNI</abbr></a>**。
     * SNI 扩展允许一台服务器（具有 **单个 IP 地址**）拥有 **多个 HTTPS 证书** 并提供 **多个 HTTPS 域名/应用程序**。