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size(ContentLength). Closing DataStream does not close RawStream. Options processed:
call(Closure, RawStream, BytesLeft)when DataStream is closed. BytesLeft is the number of bytes of the range stream that have not been read, i.e., 0 (zero) if all data has been read from the stream when the range is closed. This was introduced for supporting Keep-alive in http_open/3 to reschedule the original stream for a new request if the data of the previous request was processed.