Hi All

I seem to be experiencing an intermittent fault with the utils http_query() 
method.  We are implementing a routing and white list component that is 
accessed via a REST api, however i have observed several occasions where this 
is logged:
Jan 30 16:04:17 vs-kam-prod02 /usr/local/sbin/kamailio[13184]: ERROR: utils 
[functions.c:149]: http_query(): failed to perform curl (28)

The indicated error number (28) seems to suggest a timeout is occurring with 
curl, however examining a capture of network traffic when this happens shows 
that a http request is not sent from the server to the destination at all, 
usually attempting a second call results in everything working correctly.

As stated its intermittent in its nature and so I cannot reliably trigger this 
issue, other than through sheer repetition, so any ideas as to what could be 
causing this issue would be gratefully received,
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