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

I have updated the http_async_client documentation for master and 5.0.

Please note that in respect to 4.4 http_async_query() now only takes 2 parameters: the payload is passed with $http_req(body).

Giacomo

On 25 April 2017 at 22:09, Giacomo Vacca giacomo.vacca@gmail.com wrote:

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@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@lists.kamailio.org] *On Behalf Of *Ramachandran, Agalya (Contractor) *Sent:* Tuesday, April 25, 2017 10:17 AM *To:* giacomo.vacca@gmail.com; sr-users@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