move helper func in related packages

server/utils/utils.go

@@ -0,0 +1,11 @@
+package utils
+
+import "bytes"
+
+func TrimHostPort(host []byte) []byte {
+	i := bytes.IndexByte(host, ':')
+	if i >= 0 {
+		return host[:i]
+	}
+	return host
+}