[SR-Users] Query with regard to http_client and http_async_client

[Giacomo Vacca]

Hi,
reusing the same connection to the same url is delegated to liburl, so you
can have that when using http_async_client.
More workers will increase the capacity at the price of resources (shared
memory).
I wrote a wrap up about building the request payload here:
https://lists.kamailio.org/pipermail/sr-users/2016-December/095454.html -
please double check escaping.
The function methods have been reviewed in version 5 and removed, replaced
by pseudovariable settings which is more common practice in kamailio.
Instead of http_append_header() use
$http_req(hdr) = "X-theheader: the value";

Instead of http_set_method() use
$http_req(method) = "POST";

The latest documentation requires a little review for some mentions of the
old functions. Will try to fix as soon as possible.

Best Regards,
Giacomo

On 25 April 2017 at 19:02, Pranathi Venkatayogi <pvenkatayogi at cyracom.com>
wrote:

> I recently successfully used http_async_client for POST. Will try to help
> you out here -
>
>
>
> *From:* sr-users [mailto:sr-users-bounces at lists.kamailio.org] *On Behalf
> Of *Ramachandran, Agalya (Contractor)
> *Sent:* Tuesday, April 25, 2017 10:17 AM
> *To:* giacomo.vacca at gmail.com; sr-users at lists.kamailio.org
> *Subject:* [SR-Users] Query with regard to http_client and
> http_async_client
>
>
>
> Hi Giacomo,
>
>
>
> I have few questions with regard to rest client in kamailio.
>
>
>
> 1)     I see there are two modules in kamailio for rest client.
> http_client, http_async_client.
>
> I hope http_client does the http transfer in synchronous  way.
>
> http_async_client does the http transfer in asynchronous manner.
>
> Correct me if am wrong here.
>
> Correct.
>
> 2)     I want to achieve https transfers in async way, so choosing
> http_async_client.
>
> Is there a way that kamailio *maintains persistent TCP connection
>  pooling for http transfer*.
>
> I see there is a “workers” parameter in http_async_client. By increasing
> this number does it result it more http request’s handling?
>
> Let the author reply here.
>
> 3)     Also, I have some questions regarding documentation for module
> http_async_client in 5.0 version.
>
> In the API exposure, it says *“http_async_query(url, route_name)”*.
>
> But the example if I want to use *POST*, it says *“http_async_query("http://example.com/test.php
> <http://example.com/test.php>", "{'r_uri':'$rU', 'f_uri':'$fU'}",
> "HTTP_REPLY");”*
>
> There is a parameter mismatch between the example and the actual function.
>
>
>
> If I try to use *GET* query, kamailio service is starting. But if I try
> to give the *POST* query with payload, kamailio service is not started.
>
> It says, sctp_core_destroy(): SCTP API not initialized.
>
>
>
> Also I have noticed that, functions like http_append_header(),http_set_method()
> are removed in 5.0 version, whereas we have this API’s is 4.x versions.
>
> Is there some issue with the documentation for 5.0  ?
>
>
>
> I used it like this and it works - http_async_query("http://TEXT_
> BROKER/api/events/CallAnswered",
>
>                  "{'CallId':'$ci', 'Time' : '$TF'}",
>
>  "HTTP_REPLY");
>
> Issue may be with quotes. Make sure you don’t have “ in the second
> parameter content. If you send Kamailio log it will be easier to debug.
>
>
>
> Please let me the know the details for the above queries.
>
>
>
> Regards,
> Agalya
>
>
>
>
>
>
>
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