private fun List<String?>.toQueryString(out: StringBuilder) {
      for (i in 0 until size step 2) {
        val name = this[i]
        val value = this[i + 1]
        if (i > 0) out.append('&')
        out.append(name)
        if (value != null) {
          out.append('=')
          out.append(value)
        }
      }
    }

    /**

    peer.play()

    // Play it back.
    val connection = connect(peer)
    val client = connection.newStream(headerEntries("b", "banana"), true)
    val out = client.getSink().buffer()
    out.write(EMPTY_BYTE_ARRAY)
    out.flush()
    out.close()

    // Verify the peer received what was expected.
    assertThat(peer.takeFrame().type).isEqualTo(Http2.TYPE_HEADERS)