Hello!

I am currently working on a filter module, in which I would like to rewrite the content
received from an upstream. Similar to `gzip` module, I don't know the exact value to
set to the 'Content-Length' header field during filtering the headers of the request,
not only before processing part of the request's body.

Is there any way I can postpone the transmission of the response headers until
the time this value can be calculated during the filtering of the request body?

Thank you in advance!
Christos Kontas, kontas@ceid.upatras.gr

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