fix metadata

dialer/http2/h2/dialer.go

@@ -123,13 +123,16 @@ func (d *h2Dialer) Dial(ctx context.Context, address string, opts ...dialer.Dial
 	req := &http.Request{
 		Method:     http.MethodConnect,
 		URL:        &url.URL{Scheme: "https", Host: host},
-		Header:     make(http.Header),
+		Header:     d.md.header,
 		ProtoMajor: 2,
 		ProtoMinor: 0,
 		Body:       pr,
 		Host:       host,
 		// ContentLength: -1,
 	}
+	if req.Header == nil {
+		req.Header = make(http.Header)
+	}
 	if d.md.path != "" {
 		req.Method = http.MethodGet
 		req.URL.Path = d.md.path

dialer/http2/h2/metadata.go

@@ -1,23 +1,33 @@
 package h2
 
 import (
+	"net/http"
+
 	mdata "github.com/go-gost/core/metadata"
 	mdx "github.com/go-gost/x/metadata"
 )
 
 type metadata struct {
-	host string
-	path string
+	host   string
+	path   string
+	header http.Header
 }
 
 func (d *h2Dialer) parseMetadata(md mdata.Metadata) (err error) {
 	const (
-		host = "host"
-		path = "path"
+		host   = "host"
+		path   = "path"
+		header = "header"
 	)
 
 	d.md.host = mdx.GetString(md, host)
 	d.md.path = mdx.GetString(md, path)
-
+	if m := mdx.GetStringMapString(md, header); len(m) > 0 {
+		h := http.Header{}
+		for k, v := range m {
+			h.Add(k, v)
+		}
+		d.md.header = h
+	}
 	return
 }

dialer/http2/metadata.go

@@ -4,8 +4,7 @@ import (
 	mdata "github.com/go-gost/core/metadata"
 )
 
-type metadata struct {
-}
+type metadata struct{}
 
 func (d *http2Dialer) parseMetadata(md mdata.Metadata) (err error) {
 	return