Corrected fallback responseHeaders value to be null
#4110
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- The return value should match that of the function XMLHttpRequest.getAllResponseHeaders() which returns a string, or null if no response headers have been received, or empty string on a network error.
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XMLHttpRequest.getAllResponseHeaders()which returns a string of valid headers, ornullif no response headers have been received, or empty string on a network error.[]) would lead to an error when passed toUtils.parseHttpHeaders()