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, err := net.ResolveTCPAddr(netw, 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)}