@Override
  public Object getValue(String s) {
    return delegateSession.getValue(s);
  }
@param delegateSession An {@link SSLSession} to delegate to in most cases.
@param peerCertsToReturn If not {@code null}, return these certificates in {@link #getPeerCertificates()} instead
                         of delegating.
ambry-test-utils/src/main/java/com/github/ambry/rest/MockSSLSession.java