I am going to subscribe event from polygon mainnet token contract, but connection not open to send() error comes out

const { contractAddress } = process.env;

const Web3 = require('web3');

const url = 'wss://ws-mumbai.matic.today/';
const web3 = new Web3(url);

const options = {
reconnect: {
auto: true,
delay: 1000, // ms
maxAttempts: 1,
onTimeout: false,
},
address: contractAddress,
topics: [
'0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef',
],

function initSubscription() {
web3.eth
.subscribe('logs', options, (error, result) => {
if (!error) console.log('got result');
else console.log('error - ', error);
})
.on('data', (log) => {
console.log('got data', log);
})
.on('changed', (log) => {
console.log('changed');
});
}
};

wss url is not right? if so, what is the matter with this issue?