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curl_http_post: Debug data usage

From: Kman Devnull <>
Date: Wed, 18 Jan 2017 13:26:09 +0000

Further to the below email, just wanted to check on how to debug using Curl
the data usage.

Is there a curl_option/something that could help debug the data usage.

Currently my data usage using curl_http post is 3MB per day. I honestly
don't believe that my IoT sensor is sending so much data across.

Kindly help.

Many thanks.

On Tue, Jan 17, 2017 at 11:41 PM, Kman Devnull <>

> Hi Daniel,
> Is there any curl_debug option, to capture the exact amount of data usage
> that is happening via http_post?
> thanks.
> On Tue, Jan 17, 2017 at 11:10 PM, Daniel Stenberg <> wrote:
>> On Tue, 17 Jan 2017, Kman Devnull wrote:
>> I am currently using HTTP_POST with curl on my RPi like device to send
>>> data to cloud from my IoT sensor. It consumes around 3MB of data on my SIM
>>> connection.
>>> Is there anything I could set in my curl/options to minimize the
>>> data_usage? i.e. something like may be to strip away all the HTTP headers,
>>> and to ensure only the actual data is sent across ?
>> If you check how much headers curl sends in a request like that, you'll
>> notice that the total ammount will be at max a few hundred bytes. If you'd
>> do it over http2 it could compress the headers, even if it would compress
>> really good you'd only gain data in the order of hundreds of bytes and
>> you're talking about a 3MB post here.
>> Your post is large simply because you're sending large amounts of data.
>> --
>> /
>> -------------------------------------------------------------------
>> List admin:
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Received on 2017-01-18