[OpenSIPS-Users] Async rest_client timeout

[Callum Guy]

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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