Yes, it does. And, although, there are plenty of ways to use it 
“asynchronously” without using http_async_client (e.g. mqueue and rtimer, or 
the async module wrappers), you’ll find that http_async_client, viewed in that 
light, doesn’t seem so complicated after all. 

—
Sent from mobile, with due apologies for brevity and errors.

> On Jan 21, 2021, at 11:40 AM, Alejandro Recarey <[email protected]> wrote:
> 
> 
> Hi all,
> 
> Sorry if this question is answered somewhere else but I'm not finding the 
> answer in the documentation.
> 
> Does calling http_client_query() in the http_client module block kamailio's 
> thread until the http request returns? I'm asking because of scalability 
> issues. My plan is to use it to get some information from my system, and so 
> it will be called for every INVITE request, and I'm afraid of the performance 
> considerations.
> 
> I see there is a http_async_client module that should get around this but of 
> course, it seems harder to use.
> 
> Thanks for your help,
> 
> Alex
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