[AWS] Reproducing the 200/304 HTTP status code logging problem

[Pascal Obry]

Thomas,

> This small example show the problem: When AWS return a 304 not
> modified header, it logs it as 200 0, instead of 304 -.

Thanks, note that it is better to provide a standalone reproducer that 
can be added into the test suite when possible. Anyway this is now 
fixed, a test added.

Thanks.

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