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Why does first ever HttpSendRequest take longer?

Posted on 16th Feb 2014 07:03 pm by admin

I promise this isn't as simple as it sounds. I'm wondering why the the first ever call to HttpSendRequest takes much longer than subsequent calls, even when the later requests are for a different URL. For example:

InternetConnect(... "foo.com" ...) // returns immediately
HttpOpenRequest(...) // returns immediately
HttpSendRequest(...) // takes ~3 sec
HttpSendRequest(...) // takes ~200 ms

InternetConnect(... "bar.com" ...) // returns immediately
HttpOpenRequest(...) // returns immediately
HttpSendRequest(...) // takes ~200 ms

Why does the first HttpSendRequest(...) take so much longer? This is very consistent, regardless of the URLs.

Thanks,