From 8ab44dcb446e8242b41a4d80b69991d36d8b832d Mon Sep 17 00:00:00 2001
From: yqiangli <yqiangli@tencent.com>
Date: Tue, 31 Mar 2020 21:50:15 +0800
Subject: [PATCH 1/2] Get ghttp a chance to add custom host.

---
 net/ghttp/ghttp_client_request.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ghttp/ghttp_client_request.go b/net/ghttp/ghttp_client_request.go
index 5689b4b3b..525210b2f 100644
--- a/net/ghttp/ghttp_client_request.go
+++ b/net/ghttp/ghttp_client_request.go
@@ -186,6 +186,10 @@ func (c *Client) DoRequest(method, url string, data ...interface{}) (resp *Clien
 	// Custom header.
 	if len(c.header) > 0 {
 		for k, v := range c.header {
+			// Set host by req.Host.
+			if strings.ToLower(k) == "host" {
+				req.Host = v
+			}
 			req.Header.Set(k, v)
 		}
 	}

From 718089fc11dee2d9ec7c3cbcb317522eede6c88c Mon Sep 17 00:00:00 2001
From: yqiangli <yqiangli@tencent.com>
Date: Tue, 31 Mar 2020 23:28:21 +0800
Subject: [PATCH 2/2] Get ghttp a chance to add custom host.

---
 net/ghttp/ghttp_client_request.go | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/net/ghttp/ghttp_client_request.go b/net/ghttp/ghttp_client_request.go
index 525210b2f..15a58eeaf 100644
--- a/net/ghttp/ghttp_client_request.go
+++ b/net/ghttp/ghttp_client_request.go
@@ -186,13 +186,20 @@ func (c *Client) DoRequest(method, url string, data ...interface{}) (resp *Clien
 	// Custom header.
 	if len(c.header) > 0 {
 		for k, v := range c.header {
-			// Set host by req.Host.
-			if strings.ToLower(k) == "host" {
-				req.Host = v
-			}
 			req.Header.Set(k, v)
 		}
 	}
+	// For server requests Host specifies the host on which the
+	// URL is sought. Per RFC 2616, this is either the value of
+	// the "Host" header or the host name given in the URL itself.
+	// It may be of the form "host:port".
+	//
+	// For client requests Host optionally overrides the Host
+	// header to send. If empty, the Request.Write method uses
+	// the value of URL.Host.
+	if host := req.Header.Get("Host"); host != "" {
+		req.Host = host
+	}
 	// Custom Cookie.
 	if len(c.cookies) > 0 {
 		headerCookie := ""