On Fri, 28 Mar 2008, Administrator Proxy-List wrote:

> curl_multi does not processing multiple cURL handles in parallel when SOCKS
> type proxies are used.

And as I pointed out on the other list you posted this to, this is a known
libcurl bug mentioned in docs/KNOWN_BUGS:

35. Both SOCKS5 and SOCKS4 proxy connections are done blocking, which is very
   bad when used with the multi interface.

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