[sr-dev] [kamailio/kamailio] http_client: Plumbing of CURL errors through $curlerror seems incorrect (#2154)

[Alex Balashov]

On Kamailio 5.3.0 (`ad1905`) on CentOS 7, with `libcurl` 7.29.0-46, an `http_connect()` request to an unresponsive server...

```
http_connect("stuff", "/url, "$var(http_res)");
```

.. correctly sets `$var(http_res)` to `28`, which is an operation timeout per https://curl.haxx.se/libcurl/c/libcurl-errors.html.

However, `$curlerror($var(http_res))` returns the value `"No error"`. This is not quite as promised in https://kamailio.org/docs/modules/5.3.x/modules/http_client.html#idm480.

Thanks in advance!

-- Alex

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