Ah right, I understand what you mean. I wouldn't call it a "leak" but it is a waste yes and the lack of removal support is... silly. Just the result of me being a bit lazy when I wrote that code.

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** [bugs:#1431] removing names from DNS cache with CURLOPT_RESOLVE is not implemented**
**Status:** open
**Labels:** dns memory leak 
**Created:** Tue Oct 07, 2014 09:19 AM UTC by ygrek
**Last Updated:** Tue Oct 07, 2014 10:01 AM UTC
**Owner:** Daniel Stenberg
Removing names from DNS cache with CURLOPT_RESOLVE is not implemented (see TODO in Curl_loadhostpairs). With the fix 31860ab for https://sourceforge.net/p/curl/bugs/1327/ it means that constantly adding and deleting hostcache entries with CURLOPT_RESOLVE creates a memory leak, as such entries are never removed (nor by request nor automatically).
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