sslSocketFactory

Sets the socket factory and trust manager used to secure HTTPS connections. If unset, the system defaults will be used.

Most applications should not call this method, and instead use the system defaults. Those classes include special optimizations that can be lost if the implementations are decorated.

If necessary, you can create and configure the defaults yourself with the following code:

TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init((KeyStore) null);
TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
    throw new IllegalStateException("Unexpected default trust managers:"
        + Arrays.toString(trustManagers));
}
X509TrustManager trustManager = (X509TrustManager) trustManagers[0];

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, new TrustManager[] { trustManager }, null);
SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

OkHttpClient client = new OkHttpClient.Builder()
    .sslSocketFactory(sslSocketFactory, trustManager)
    .build();