*  Fix: Change `MediaType.charset()` to return null for unexpected charsets.
 *  Fix: Don't skip cache invalidation if the invalidating response has no body.
 *  Fix: Don't use a cryptographic random number generator for web sockets. Some Android devices
    implement `SecureRandom` incorrectly!
 *  Fix: Correctly canonicalize IPv6 addresses in `HttpUrl`. This prevented OkHttp from trusting

    listener: WebSocketListener,
  ): WebSocket {
    val webSocket =
      RealWebSocket(
        taskRunner = taskRunner,
        originalRequest = request,
        listener = listener,
        random = Random(),
        pingIntervalMillis = pingIntervalMillis.toLong(),
        // extensions is always null for clients:
        extensions = null,
        minimumDeflateSize = minWebSocketMessageToCompress,