How can I use nonsecure connection to localhost instead of secure one

Question

I'm pretty new with EOS programming and I'm trying to run simple broadcast transaction. I'm using following code:

let transaction = EosioTransaction()
transaction.rpcProvider = EosioRpcProvider(endpoint: URL(string: "http://localhost:8888")!)
transaction.serializationProvider = EosioAbieosSerializationProvider()
transaction.signatureProvider = try EosioSoftkeySignatureProvider(privateKeys: ["yourPrivateKey"])
/// Actions can now be added to the transaction, which can, in turn, be signed and broadcast:
let action = try EosioTransaction.Action(
    account: EosioName("eosio.token"),
    name: EosioName("transfer"),
    authorization: [EosioTransaction.Action.Authorization(
        actor: EosioName("useraaaaaaaa"),
        permission: EosioName("active"))
    ],
    data: Transfer(
        from: EosioName("useraaaaaaaa"),
        to: EosioName("useraaaaaaab"),
        quantity: "42.0000 SYS",
        memo: "")
)
transaction.add(action: action)
transaction.signAndBroadcast { (result) in
    switch result {
    case .failure (let error):
        // Handle error.
    case .success:
        // Handle success.
    }
}

Unfortunately at the end I'm receiving following error:

Error was encountered in RpcProvider. The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

I'm running nodes with following parameters:

nodeos -e -p eosio \
--plugin eosio::producer_plugin \
--plugin eosio::producer_api_plugin \
--plugin eosio::chain_api_plugin \
--plugin eosio::http_plugin \
--plugin eosio::history_plugin \
--plugin eosio::history_api_plugin \
--filter-on="*" \
--access-control-allow-origin='*' \
--contracts-console \
--http-validate-host=false \
--verbose-http-errors

Can someone suggest me where I'm wrong and how to run this test connecting to my http://localhost:8888?