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self.addEventListener('message', async (e) => {
const url = e.data;
try {
const ws = new WebSocket(url);
const result = await new Promise(resolve => {
ws.onopen = () => {
ws.close();
resolve(true);
};
ws.onerror = () => resolve(false);
});
e.source.postMessage({success: result});
} catch (err) {
e.source.postMessage({success: false, error: err.name});
}
});