`NullPointerException`.
 *  New: Recover gracefully when Android's socket connections crash with an
    unexpected `ClassCastException`.
 *  Fix: Don't include the URL's fragment in `encodedQuery()` when the query
    itself is empty.

## Version 3.9.0

_2017-09-03_

 *  **Interceptors are more capable.** The `Chain` interface now offers access

  private const val SERVFAIL = 2
  private const val NXDOMAIN = 3
  const val TYPE_A = 0x0001
  const val TYPE_AAAA = 0x001c
  private const val TYPE_PTR = 0x000c
  private val ASCII = Charsets.US_ASCII

  fun encodeQuery(
    host: String,
    type: Int,
  ): ByteString =
    Buffer()
      .apply {
        writeShort(0) // query id
        writeShort(256) // flags with recursion
        writeShort(1) // question count

    hostname: String,
    type: Int,
  ): Request =
    Request
      .Builder()
      .header("Accept", DNS_MESSAGE.toString())
      .apply {
        val query = DnsRecordCodec.encodeQuery(hostname, type)

        val dnsUrl: HttpUrl = ******@****.***
        if (post) {
          url(dnsUrl)
            .cacheUrlOverride(
              dnsUrl
                .newBuilder()