go 获取http请求中的ip地址

之前也是简单记载了一下获取http中的ip地址
这是之前的文章
https://blog.csdn.net/shunuanwei/article/details/121746761?spm=1001.2014.3001.5501
这次，我突然想到这个地方 ，我在仔细研究一下，或者说，在调整一下代码
嗯～～

import "net/http"

// 获取请求中的IP
func RemoteIp(req *http.Request) string {
	var remoteAddr string
	// RemoteAddr
	remoteAddr = req.RemoteAddr
	if remoteAddr != "" {
		return remoteAddr
	}
	// ipv4
	remoteAddr = req.Header.Get("ipv4")
	if remoteAddr != "" {
		return remoteAddr
	}
	//
	remoteAddr = req.Header.Get("XForwardedFor")
	if remoteAddr != "" {
		return remoteAddr
	}
	// X-Forwarded-For
	remoteAddr = req.Header.Get("X-Forwarded-For")
	if remoteAddr != "" {
		return remoteAddr
	}
	// X-Real-Ip
	remoteAddr = req.Header.Get("X-Real-Ip")
	if remoteAddr != "" {
		return remoteAddr
	} else {
		remoteAddr = "127.0.0.1"
	}
	return remoteAddr
}