如何使用golang nethttp在服务器中获取服务器自己的地址？

概述我想使用Golang的net / http包写一个HTTP服务器,其反应取决于HTTP连接的服务器端IP地址. 换句话说,我要找的是CGI的“SERVER_ADDR”变量. http.Request中最接近的字段是“Host” – 但是如果请求使用文字地址,它只会等于地址,我不能使用它(服务器可能按名称使用). 查看https://golang.org/src/net/http/server.go 我想使用Golang的net / Http包写一个http服务器,其反应取决于http连接的服务器端IP地址.

换句话说,我要找的是CGI的“SERVER_ADDR”变量.

http.Request中最接近的字段是“Host” – 但是如果请求使用文字地址,它只会等于地址,我不能使用它(服务器可能按名称使用).

查看https://golang.org/src/net/http/server.go的源代码,似乎获取服务器地址的唯一方法是Hijack()处理程序内的连接,并为同一连接上的后续请求实现后续http解析,但至少可以说它非常不优雅…

看起来理想的解决方案是将golang标准库中的http / request和http / server修改如下：

diff -u go-stock-library/request.go ./request.go--- go-stock-library/request.go 2016-04-13 17:31:48.000000000 +0200+++ ./request.go    2016-04-13 17:32:40.000000000 +0200@@ -227,6 +227,15 @@    // This fIEld is ignored by the http clIEnt.    RemoteAddr string+   // LocalAddr allows http servers and other software to record+   // the network address that the request was sent to,usually for+   // logging. This fIEld is not filled in by ReadRequest and+   // has no defined format. The http server in this package+   // sets LocalAddr to an "IP:port" address before invoking a+   // handler.+   // This fIEld is ignored by the http clIEnt.+   LocalAddr string+    // RequestURI is the unmodifIEd Request-URI of the    // Request-line (RFC 2616,Section 5.1) as sent by the clIEnt    // to a server. Usually the URL fIEld should be used instead.diff -u go-stock-library/server.go ./server.go--- go-stock-library/server.go  2016-04-13 17:29:19.000000000 +0200+++ ./server.go 2016-04-13 17:31:38.000000000 +0200@@ -161,6 +161,13 @@    // This is the value of a Handler's (*Request).RemoteAddr.    remoteAddr string+   // serverAddr is rwc.LocalAddr().String(). It is not populated synchronously+   // insIDe the Listener's Accept goroutine,as some implementations block.+   // It is populated immediately insIDe the (*conn).serve goroutine.+   // This is the value of a Handler's (*Request).LocalAddr.+   localAddr string+   +    // tlsstate is the TLS connection state when using TLS.    // nil means not TLS.    tlsstate *tls.ConnectionState@@ -736,6 +743,7 @@    delete(req.header,"Host")    req.RemoteAddr = c.remoteAddr+   req.LocalAddr = c.localAddr    req.TLS = c.tlsstate    if body,ok := req.Body.(*body); ok {        body.doEarlyClose = true@@ -1382,6 +1390,7 @@ // Serve a new connection. func (c *conn) serve() {    c.remoteAddr = c.rwc.RemoteAddr().String()+   c.localAddr = c.rwc.LocalAddr().String()    defer func() {        if err := recover(); err != nil {            const size = 64 << 10

然后以一种干净利落的方式在代码中使用新的LocalAddr.

我错过了什么,有更清洁的方法吗？

解决方法 我个人不会修改标准库中的任何内容,因为我可以通过其他方式获得.从每个连接解析它有一些优势吗？

可能有一种更简单的方法,但我有以下几点.

func getMyInterfaceAddr() (net.IP,error) {    ifaces,err := net.Interfaces()    if err != nil {        return nil,err    }    addresses := []net.IP{}    for _,iface := range ifaces {        if iface.Flags&net.FlagUp == 0 {            continue // interface down        }        if iface.Flags&net.Flagloopback != 0 {            continue // loopback interface        }        addrs,err := iface.Addrs()        if err != nil {            continue        }        for _,addr := range addrs {            var ip net.IP            switch v := addr.(type) {            case *net.IPNet:                ip = v.IP            case *net.IPAddr:                ip = v.IP            }            if ip == nil || ip.IsLoopback() {                continue            }            ip = ip.To4()            if ip == nil {                continue // not an ipv4 address            }            addresses = append(addresses,ip)        }    }    if len(addresses) == 0 {        return nil,fmt.Errorf("no address Found,net.InterfaceAddrs: %v",addresses)    }    //only need first    return addresses[0],nil}

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