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onmessage = function (e) {
let xhr = new XMLHttpRequest();
let already_sent = false;
xhr.addEventListener("readystatechange", event => {
try {
event.originalTarget.send("test");
} catch (error) {
if (error.name == "InvalidStateError") {
if (!already_sent) {
postMessage(error.name);
already_sent = true;
}
}
}
});
xhr.open("POST", e.data, false);
xhr.send();
};