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Re: verbose/debug and seeing data on the line

From: Daniel Stenberg <>
Date: Mon, 25 Jan 2016 00:09:45 +0100 (CET)

On Fri, 22 Jan 2016, Dima Tisnek wrote:

> I'm trying to code up a multithreaded network throttle. That is I want to
> throttle total network utilisation, as opposed to a single connection.
> I'm thinking what's the best way to grab actual number of bytes sent /
> received on the network.
> read function / write function are not correct due to possible compression

Then you just need to make sure you don't uncompress the data automatically
and it shouldn't be a problem! TLS compression is considered bad anyway these
days so I would guess that's now pretty rare.

> I've tried to follow SSL in / out from debug function with verbose 1, but it
> seems I don't actually get all the data, rather I get ssl headers or
> something like that (typical data len == 5, apart from a few packets
> (certificates?))

Yeah, the SSL in/out stuff is just some data during the handshake and it is
not the full payload through the transfer.

> What's correct hook-up here?

Don't tell libcurl to uncompress data for you and just use the debugfunction I

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Received on 2016-01-25