synchronized static void setDefaultHostnameVerifier(ConscryptHostnameVerifier verifier) {
        defaultHostnameVerifier = verifier;
    }
Set the default hostname verifier that will be used for HTTPS endpoint identification.  If
{@code null} (the default), endpoint identification will use the default hostname verifier
set in {@link HttpsURLConnection#setDefaultHostnameVerifier(javax.net.ssl.HostnameVerifier)}.
common/src/main/java/org/conscrypt/TrustManagerImpl.java