Installation guide for OpenSSL adviced me to copy opessl libs to C:/MinGW/lib and includes to C:/MinGW/includes.
I did it.
After that, I tried: configure -release -openssl -I C:/MinGW/include -L C:/MinGW/lib
mingw32-make
After that i launched C:\Qt\4.3.3\examples\network\http\release,
entered url https://sourceforge.net/.
The result was the message "Download failed: Found"
Please, any help!
P.S. This example works fine through http protocol without ssl support.
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