void envia(String postData){
    HTTPClient http;

    // Lista de servidores de destino
    String servidores[2] = {
        "http://modulo4.migueldebarba.com.br/insertleitura.php",
        "http://modulo5.migueldebarba.com.br/insertleitura.php"
    };

    for (int i = 0; i < 2; i++) {
        http.begin(client, servidores[i]);
        http.addHeader("Content-Type", "application/x-www-form-urlencoded");
        int httpCode = http.POST(postData);
        String payload = http.getString();

        Serial.println("Servidor: " + servidores[i]);
        Serial.println("httpCode: " + String(httpCode));
        Serial.println("payload: " + payload);

        http.end();
    }
}