diff --git a/winixd/core/header.h b/winixd/core/header.h
index 6483f5b..3e47a96 100644
--- a/winixd/core/header.h
+++ b/winixd/core/header.h
@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2021-2022, Tomasz Sowa
+ * Copyright (c) 2021-2023, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -81,6 +81,7 @@ public:
 	static constexpr const wchar_t * application_xhtml_xml		= L"application/xhtml+xml";
 	static constexpr const wchar_t * text_csv					= L"text/csv";
 	static constexpr const wchar_t * text_javascript			= L"text/javascript";
+	static constexpr const wchar_t * text_xml					= L"text/xml";
 
 	static constexpr const wchar_t * all_all					= L"*/*";
 	static constexpr const wchar_t * text_all					= L"text/*";
@@ -92,6 +93,7 @@ public:
 	static constexpr const wchar_t * application_xhtml_xml_utf8	= L"application/xhtml+xml; charset=UTF-8";
 	static constexpr const wchar_t * text_csv_utf8				= L"text/csv; charset=UTF-8";
 	static constexpr const wchar_t * text_javascript_utf8		= L"text/javascript; charset=UTF-8";
+	static constexpr const wchar_t * text_xml_utf8				= L"text/xml; charset=UTF-8";
 
 	static constexpr const wchar_t * application_x_www_form_urlencoded 	= L"application/x-www-form-urlencoded";
 	static constexpr const wchar_t * multipart_form_data 				= L"multipart/form-data";