Sends the request. If the request is asynchronous (which is the default), this method returns as soon as the request is sent.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send
Optional
data: string | FormDataSets the value of an HTTP request header. You must call setRequestHeader() after open(), but before send().
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
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See
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/abort