Re: question about %b, %O (log_io) and %X formats

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On 4/17/07, Alex <finest137@xxxxxxxxx> wrote:

However, I run into records where %b is exactly the file size,
while %X is X, and %O is much
lower than %b.

As I rely upon %b to count file downloads, this seems very
disturbing. :( Do I miss something here?

I don't understand your confusion. If the response is aborted, it is
natural that the actual number of bytes sent to the client (%O) is
smaller than the size of the resource the server attempted to send
(%b). In reality, %b is not a reliable measure of anything except
exactly what it is defined as: the number of bytes the server is
*attempting* to send. If you want to count traffic, you need to use
%O.


Apache version 2.0.49 on Centos Linux. Below is a sample line
from log.

Quite an old version. There may be any number of bugs also affecting this.

Joshua.

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