DownloadFinished 
    data class DownloadFinished(val downloadType: HttpRequestType, val url: String, val lastRedirectLocation: String?, val downloadTime: Double, val httpStatus: Int, val size: Long, val isSuccess: Boolean) : SourceEvent
Emitted when a download was finished.
Properties
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                  The time needed to finish the request, in seconds.
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                  Which type of request this was.
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                  The HTTP status code of the request. If opening the connection failed, a value of 0 is returned.
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                  The last redirect location, or null if no redirect happened.