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http://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-document [[ Then append ";charset=encoding" to mime type. ]] "encoding" here isn't actually a string, right? Not clear (unless I'm missing something) which label should be used, if uppercase is allowed, etc.
https://github.com/whatwg/xhr/commit/8f95fa08c234eb2d77622b58173f15d1e44f3d90