override fun write(
      source: Buffer,
      byteCount: Long,
    ) {
      check(!closed) { "closed" }
      if (byteCount == 0L) return

      with(socket.sink) {
        writeHexadecimalUnsignedLong(byteCount)
        writeUtf8("\r\n")
        write(source, byteCount)
        writeUtf8("\r\n")
      }
    }

    @Synchronized
    override fun flush() {

        headers_.add("Transfer-encoding: chunked")

        val bytesOut = Buffer()
        while (!body.exhausted()) {
          val chunkSize = minOf(body.size, maxChunkSize.toLong())
          bytesOut.writeHexadecimalUnsignedLong(chunkSize)
          bytesOut.writeUtf8("\r\n")
          bytesOut.write(body, chunkSize)
          bytesOut.writeUtf8("\r\n")
        }
        bytesOut.writeUtf8("0\r\n") // Last chunk. Trailers follow!