The `okhttp-ws` submodule is no longer available and `okhttp-ws` artifacts from previous
    releases of OkHttp are not compatible with OkHttp 3.5. When upgrading to the new package
    please note that the `WebSocket` and `WebSocketCall` classes have been merged. Sending messages
    is now asynchronous and they may be enqueued before the web socket is connected.

        }
        require(null !in (protocolsCopy as List<Protocol?>)) {
          "protocols must not contain null"
        }

        // Remove protocols that we no longer support.
        @Suppress("DEPRECATION")
        protocolsCopy.remove(Protocol.SPDY_3)

        if (protocolsCopy != this.protocols) {
          this.routeDatabase = null
        }