'req.socket.bytesRead and req.socket.bytesWritten do not increment their value on some requests (nodejs and express)

req.socket.bytesRead and req.socket.bytesWritten do not increase their value in some requests, I thought it was some kind of error of how I was measuring the increments, but no, in some requests the value does not increase and I got that the bytes written or read were 0 (the difference between the accumulated read/write minus the current one)

log of read and write bytes

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in some requests the values are not incremented, so would I have to infer that nothing was read? and it seems that in the requests where it increases I accumulate all the requests where it does not change

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