Description:
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the same target url, using ip address, local area network
compare:
1 curl using get method with long query string, about 2 tcp packs without body.
2 curl using post with short post data, no more than 1 tcp packs
3 stream function emulate post data, about 2 tcp packs with header
4 curl using post with a little big body, about 2 tcp packs with header

the three before cost no more than 0.2 second
the 4th always cost more than 1 second,  avg 2 second

max data size in query string or post data less than 2000 bytes.