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        macAddressField.setAccessible(true);
        byte[] parsedMac = (byte[]) macAddressField.get(response);
        assertArrayEquals(testMac, parsedMac);

        // Verify stats were parsed
        // Stats length = rDataLength - (numberOfNames * 18) - 1 = 67 - 54 - 1 = 12
        // But MAC address takes 6 bytes, so actual stats length = 12 - 6 = 6

    had a severe bug where web sockets were closed on the wrong thread, which caused
    `NullPointerException` crashes in `Deflater`.

 *  Fix: Don't crash after a web socket fails its connection upgrade. We incorrectly released
    the web socket's connections back to the pool before their resources were cleaned up.

* Nginx
* HAProxy

## Let's Encrypt { #lets-encrypt }

Before Let's Encrypt, these **HTTPS certificates** were sold by trusted third parties.

The process to acquire one of these certificates used to be cumbersome, require quite some paperwork and the certificates were quite expensive.

But then **<a href="https://letsencrypt.org/" class="external-link" target="_blank">Let's Encrypt</a>** was created.