add mws dialer

pkg/connector/http/connector.go

@@ -57,7 +57,11 @@ func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, add
 		Host:       address,
 		ProtoMajor: 1,
 		ProtoMinor: 1,
-		Header:     make(http.Header),
+		Header:     c.md.header,
+	}
+
+	if req.Header == nil {
+		req.Header = http.Header{}
 	}
 	req.Header.Set("Proxy-Connection", "keep-alive")
 
@@ -68,10 +72,6 @@ func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, add
 			"Basic "+base64.StdEncoding.EncodeToString([]byte(u+":"+p)))
 	}
 
-	for k, v := range c.md.headers {
-		req.Header.Set(k, v)
-	}
-
 	switch network {
 	case "tcp", "tcp4", "tcp6":
 		if _, ok := conn.(net.PacketConn); ok {

pkg/connector/http/metadata.go

@@ -2,6 +2,7 @@ package http
 
 import (
 	"fmt"
+	"net/http"
 	"net/url"
 	"strings"
 	"time"
@@ -12,14 +13,14 @@ import (
 type metadata struct {
 	connectTimeout time.Duration
 	User           *url.Userinfo
-	headers        map[string]string
+	header         http.Header
 }
 
 func (c *httpConnector) parseMetadata(md md.Metadata) (err error) {
 	const (
 		connectTimeout = "timeout"
 		user           = "user"
-		headers        = "headers"
+		header         = "header"
 	)
 
 	c.md.connectTimeout = md.GetDuration(connectTimeout)
@@ -33,12 +34,12 @@ func (c *httpConnector) parseMetadata(md md.Metadata) (err error) {
 		}
 	}
 
-	if mm, _ := md.Get(headers).(map[interface{}]interface{}); len(mm) > 0 {
-		m := make(map[string]string)
+	if mm, _ := md.Get(header).(map[interface{}]interface{}); len(mm) > 0 {
+		h := http.Header{}
 		for k, v := range mm {
-			m[fmt.Sprintf("%v", k)] = fmt.Sprintf("%v", v)
+			h.Add(fmt.Sprintf("%v", k), fmt.Sprintf("%v", v))
 		}
-		c.md.headers = m
+		c.md.header = h
 	}
 
 	return