fix(log): fix value of content-length always return -1 #2116
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Following #1154, the content-lengh displayed is always -1.
This is because the log is evaluated in the OnNext function and this is not the end of the request.
The real end seems to be in "OnComplete".
This also mean the log is now at the end of the request, it was near the end before, so the request time was a little bit off.
Log before :

Log After :

Don't hesitate if i'm being too pushy with all the fix PR, I also can create issues if you want.
I'm just fixing things as I see/need them.