and share it throughout the application. Requests that needs a customized
    client should call `OkHttpClient.newBuilder()` on that shared instance.
    This allows customization without the drawbacks of separate connection
    pools.

 *  **OkHttpClient is now stateless.** In the 2.x API `OkHttpClient` had getters
    and setters. Internally each request was forced to make its own complete

    static class ExitException extends Exception {
        int exitCode;

        ExitException(int exitCode) {
            this.exitCode = exitCode;
        }
    }

    //
    // Customizations available via the CLI
    //

    protected TransferListener getConsoleTransferListener(boolean printResourceNames) {
        return new SimplexTransferListener(