add compression flag option for http request

handler/http/metadata.go

@@ -22,6 +22,7 @@ const (
 type metadata struct {
 	readTimeout     time.Duration
 	keepalive       bool
+	compression     bool
 	probeResistance *probeResistance
 	enableUDP       bool
 	header          http.Header
@@ -55,10 +56,8 @@ func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
 		h.md.header = hd
 	}
 
-	h.md.keepalive = true
-	if mdutil.IsExists(md, "http.keepalive", "keepalive") {
-		h.md.keepalive = mdutil.GetBool(md, "http.keepalive", "keepalive")
-	}
+	h.md.keepalive = mdutil.GetBool(md, "http.keepalive", "keepalive")
+	h.md.compression = mdutil.GetBool(md, "http.compression", "compression")
 
 	if pr := mdutil.GetString(md, "probeResist", "probe_resist"); pr != "" {
 		if ss := strings.SplitN(pr, ":", 2); len(ss) == 2 {