import (
	"net"
	"net/http"
	"time"
)
//url 要请求的URL 
// ipaddr 当前网卡绑定的IP(一般都是网外IP)
func HttpGetFromIP(url,ipaddr string) (*http.Response,error) {
	req,_ := http.NewRequest("GET",url,nil)
	client := &http.Client{
		Transport: &http.Transport{
			Dial: func(netw,addr string) (net.Conn,error) {
				//本地地址  ipaddr是本地外网IP
				lAddr,err := net.ResolveTCPAddr(netw,ipaddr+":0")
				if err != nil {
					return nil,err
				}
				//被请求的地址
				rAddr,addr)
				if err != nil {
					return nil,err
				}
				conn,err := net.DialTCP(netw,lAddr,rAddr)
				if err != nil {
					return nil,err
				}
				deadline := time.Now().Add(35 * time.Second)
				conn.SetDeadline(deadline)
				return conn,nil
			},},}
	req.Header.Set("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/27.0.1453.93 Safari/537.36")
	return client.Do(req)
}