add authBasicRealm metadata for HTTP/HTTP2 handler

handler/http/metadata.go

@@ -8,11 +8,16 @@ import (
 	mdutil "github.com/go-gost/core/metadata/util"
 )
 
+const (
+	defaultRealm = "gost"
+)
+
 type metadata struct {
 	probeResistance *probeResistance
 	enableUDP       bool
 	header          http.Header
 	hash            string
+	authBasicRealm  string
 }
 
 func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
@@ -23,6 +28,7 @@ func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
 		knock           = "knock"
 		enableUDP       = "udp"
 		hash            = "hash"
+		authBasicRealm  = "authBasicRealm"
 	)
 
 	if m := mdutil.GetStringMapString(md, header); len(m) > 0 {
@@ -48,6 +54,7 @@ func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
 	}
 	h.md.enableUDP = mdutil.GetBool(md, enableUDP)
 	h.md.hash = mdutil.GetString(md, hash)
+	h.md.authBasicRealm = mdutil.GetString(md, authBasicRealm)
 
 	return nil
 }