OkHttp
An HTTP & HTTP/2 client for Android and Java applications. For more information see the website and the wiki.
Requirements
OkHttp works on Android 5.0+ (API level 21+) and on Java 8+.
OkHttp has one library dependency on Okio, a small library for high-performance I/O. It works with either Okio 1.x (implemented in Java) or Okio 2.x (upgraded to Kotlin).
We highly recommend you keep OkHttp up-to-date. As with auto-updating web browsers, staying current with HTTPS clients is an important defense against potential security problems. We track the dynamic TLS ecosystem and adjust OkHttp to improve connectivity and security.
OkHttp uses your platform's built-in TLS implementation. On Java platforms OkHttp also supports Conscrypt, which integrates BoringSSL with Java. OkHttp will use Conscrypt if it is the first security provider:
Security.insertProviderAt(Conscrypt.newProvider(), 1);
The OkHttp 3.12.x branch supports Android 2.3+ (API level 9+) and Java 7+. These platforms lack support for TLS 1.2 and should not be used. But because upgrading is difficult we will backport critical fixes to the 3.12.x branch through December 31, 2020.
来源：oschina
链接：https://my.oschina.net/u/70229/blog/3018373