Re: Assistance with Capturing cURL Request using tcpdump

[Kaushal Shriyan <kaushalshriyan () gmail com>]

Thanks Michael

On Tue, Oct 1, 2024 at 6:11 PM Michael Richardson <mcr () sandelman ca> wrote:

> Kaushal Shriyan <kaushalshriyan () gmail com> wrote:
>     > I am using Postman to invoke a REST API call. Is there a way to
> capture the
>     > cURL (https://curl.se/) request (including headers and body)
> initiated by
>     > the Postman REST API client to the application server running RHEL
> 8.10 OS,
>     > and then to the backend server/system using tcpdump and analyze the
> packet
>     > capture (.pcap) file in Wireshark?
>
> Yes.
> If it's HTTPS, then you will only see L3/L4 info, and no L6/7 like headers
> and body.
>
>     > Headers: Contain metadata about the request, such as content type,
> user
>     > agent, etc.
>     > Body: Contains the data that we want to send (if any). Typically
> used with
>     > POST and PUT methods.
>
> window1> tcpdump -i any -w myfile.pcap ip host postman-rest-api-client and
> tcp port 80
>
> window2> run test
>
> window1> ^C
>
> If this is on the same system, then maybe:
>    window1> tcpdump -i lo -w myfile.pcap tcp port 80


Thanks, Michael, for the quick response. Is there a way to capture and
analyze *HTTPS* traffic since the data is encrypted?

Please guide me. Thanks in advance.

Best Regards,

Kaushal
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