[OpenSIPS-Users] Async rest_client timeout

Callum Guy callum.guy at x-on.co.uk
Thu Nov 2 08:29:56 UTC 2023

I wanted to follow up with confirmation that opensips is behaving
normally here and an issue with delayed HTTP is in fact occurring
outside of the server.

My apologies for any confusion.

Best regards,


On Tue, 31 Oct 2023 at 16:21, Callum Guy <callum.guy at x-on.co.uk> wrote:
> Hi All,
> I'm seeing a small number of sessions reporting timeouts for async
> rest_client post requests. These occur at peak times for system load
> and present the following error:
> ERROR:rest_client:_resume_async_http_req: connected, but transfer timed out (5s)
> The return code is -3 and HTTP response arrives as 0. My web server
> itself shows that the requests complete in <200ms. The
> _resume_async_http_req errors arrive ~400ms after the request was
> issued.
> I suspect that something is exhausted (i.e. too many async or curl
> sessions) however I am not aware of any configuration options that
> would help.
> The following settings are employed:
>  modparam("rest_client", "connection_timeout", 4)
>  modparam("rest_client", "curl_timeout", 5)
>  modparam("rest_client", "max_async_transfers", 250)
>  modparam("rest_client", "ssl_verifyhost", 0)
> Can anyone offer advice on where I should be looking to resolve this issue?
> version: opensips 3.2.10 (x86_64/linux)
> libcurl-7.76.1-23.el9_2.1.x86_64
> Many thanks,
> Callum


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