Called when some part of the response is read. |data| contains the current bytes received since the last call. This function will not be called if the UR_FLAG_NO_DOWNLOAD_DATA flag is set on the request.
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Called when some part of the response is read. |data| contains the current bytes received since the last call. This function will not be called if the UR_FLAG_NO_DOWNLOAD_DATA flag is set on the request.