Try this:

    jansson_set("string","from"    , $hdr(From)    , "$var(post)");
     jansson_set("string","to"      , $hdr(To)      , "$var(post)");
     jansson_set("string","call-id" , $ci           , "$var(post)");

$http_req(all) = $null;
$http_req(suspend) = 0
$http_req(method) = "POST";
$http_req(hdr) = "Content-Type: application/json";
$http_req(suspend) = 0;
$http_req(body) = $var(post);

        http_async_query(
            "http://IP:PORT/someurl";,  # Endpoint
            "RELAY_API_RESPONSE" # Callback route
        );


Atenciosamente / Kind Regards / Cordialement / Un saludo,


*Sérgio Charrua*

On Thu, Sep 25, 2025 at 10:16 PM David Villasmil via sr-users <
[email protected]> wrote:

> Hello guys,
>
> I'm trying to use http_async_client to send a json to a server and it's
> supposed to use $http_req(body) to set the content... there's no way i can
> make it work:
>
> /usr/sbin/kamailio[3197588]: INFO: <script>: HTTP body:
> {"from":"XXXX","to":["XXXX"],"call_id":"fJYJFHAgao","timestamp":"2025-09-25T20:14:52Z"}
> <- my var
>  /usr/sbin/kamailio[3197588]: INFO: <script>: HTTP body: <null> <-
> $http_req
>
> cfg:
>                 xlog("L_INFO", "HTTP body: $var(body)\n");
>                 $http_req(body) = $var(body);
>                 xlog("L_INFO", "HTTP body: $http_req(body)\n");
>
> It seems to me that $http_req(body) is write only, BUT on the web server:
> {"error":"Invalid request: missing required fields (from,
> to)","received":{}} [353]
>
>
> Help is appreciated, thanks!
>
> Regards,
>
> David Villasmil
> email: [email protected]
>
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