Method setForwardHeaders

internal/nodes/http_request.go:1661–1726

设置代理相关头部信息 参考：https://tools.ietf.org/html/rfc7239

(header http.Header)

// 设置代理相关头部信息
// 参考：https://tools.ietf.org/html/rfc7239
func (this *HTTPRequest) setForwardHeaders(header http.Header) {
	// TODO 做成可选项
	if this.RawReq.Header.Get("Connection") == "close" {
		this.RawReq.Header.Set("Connection", "keep-alive")
	}

	var rawRemoteAddr = this.RawReq.RemoteAddr
	host, _, err := net.SplitHostPort(rawRemoteAddr)
	if err == nil {
		rawRemoteAddr = host
	}

	// x-real-ip
	if this.reverseProxy != nil && this.reverseProxy.ShouldAddXRealIPHeader() {
		_, ok1 := header["X-Real-IP"]
		_, ok2 := header["X-Real-Ip"]
		if !ok1 && !ok2 {
			header["X-Real-IP"] = []string{this.requestRemoteAddr(true)}
		}
	}

	// X-Forwarded-For
	if this.reverseProxy != nil && this.reverseProxy.ShouldAddXForwardedForHeader() {
		forwardedFor, ok := header["X-Forwarded-For"]
		if ok && len(forwardedFor) > 0 { // already exists
			_, hasForwardHeader := this.RawReq.Header["X-Forwarded-For"]
			if hasForwardHeader {
				header["X-Forwarded-For"] = []string{strings.Join(forwardedFor, ", ") + ", " + rawRemoteAddr}
			}
		} else {
			var clientRemoteAddr = this.requestRemoteAddr(true)
			if len(clientRemoteAddr) > 0 && clientRemoteAddr != rawRemoteAddr {
				header["X-Forwarded-For"] = []string{clientRemoteAddr + ", " + rawRemoteAddr}
			} else {
				header["X-Forwarded-For"] = []string{rawRemoteAddr}
			}
		}
	}

	// Forwarded
	/**{
		forwarded, ok := header["Forwarded"]
		if ok {
			header["Forwarded"] = []string{strings.Join(forwarded, ", ") + ", by=" + this.serverAddr + "; for=" + remoteAddr + "; host=" + this.ReqHost + "; proto=" + this.rawScheme}
		} else {
			header["Forwarded"] = []string{"by=" + this.serverAddr + "; for=" + remoteAddr + "; host=" + this.ReqHost + "; proto=" + this.rawScheme}
		}
	}**/

	// others
	if this.reverseProxy != nil && this.reverseProxy.ShouldAddXForwardedByHeader() {
		this.RawReq.Header.Set("X-Forwarded-By", this.ServerAddr)
	}

	if this.reverseProxy != nil && this.reverseProxy.ShouldAddXForwardedHostHeader() {
		if _, ok := header["X-Forwarded-Host"]; !ok {
			this.RawReq.Header.Set("X-Forwarded-Host", this.ReqHost)
		}