Fix HTTP Addr & macOS v3 m_nsUsrName is NULL (#4)

pkg/util/strings.go

@@ -32,3 +32,12 @@ func MustAnyToInt(v interface{}) int {
 	}
 	return 0
 }
+
+func IsNumeric(s string) bool {
+	for _, r := range s {
+		if !unicode.IsDigit(r) {
+			return false
+		}
+	}
+	return len(s) > 0
+}