diff --git a/winixd/core/app.cpp b/winixd/core/app.cpp
index 7cf7a7c..2f95fad 100644
--- a/winixd/core/app.cpp
+++ b/winixd/core/app.cpp
@@ -950,7 +950,7 @@ void App::Start()
 			log << log2 << "App: requests queue exceeded limit of " << config.request_queue_job_limit
 				<< " requests (skipping this request)" << logend;
 
-			cur.request->http_status = Header::status_503_service_unavailale;
+			cur.request->http_status = Header::status_503_service_unavailable;
 			cur.request->FinishRequest();
 			do_process_request = false;
 
diff --git a/winixd/core/header.h b/winixd/core/header.h
index 3e47a96..ab379d1 100644
--- a/winixd/core/header.h
+++ b/winixd/core/header.h
@@ -50,18 +50,18 @@ public:
 	 * headers' names
 	 */
 	static constexpr const wchar_t * content_type 				= L"Content-Type";
-	static constexpr const wchar_t * accept 					= L"Accept";
-	static constexpr const wchar_t * accept_language			= L"Accept-Language";
+	static constexpr const wchar_t * accept						= L"Accept";
+	static constexpr const wchar_t * accept_language				= L"Accept-Language";
 	static constexpr const wchar_t * authorization 				= L"Authorization";
 	static constexpr const wchar_t * allow 						= L"Allow";
 	static constexpr const wchar_t * very 						= L"Very";
-	static constexpr const wchar_t * origin 					= L"Origin";
+	static constexpr const wchar_t * origin						= L"Origin";
 	static constexpr const wchar_t * access_control_allow_methods 		= L"Access-Control-Allow-Methods";
-	static constexpr const wchar_t * access_control_allow_origin		= L"Access-Control-Allow-Origin";
+	static constexpr const wchar_t * access_control_allow_origin			= L"Access-Control-Allow-Origin";
 	static constexpr const wchar_t * access_control_allow_headers		= L"Access-Control-Allow-Headers";
 	static constexpr const wchar_t * access_control_allow_credentials	= L"Access-Control-Allow-Credentials";
 	static constexpr const wchar_t * access_control_expose_headers		= L"Access-Control-Expose-Headers";
-	static constexpr const wchar_t * access_control_max_age 			= L"Access-Control-Max-Age";
+	static constexpr const wchar_t * access_control_max_age				= L"Access-Control-Max-Age";
 
 	/*
 	 * headers' names lower case
@@ -77,15 +77,15 @@ public:
 
 	static constexpr const wchar_t * text_html					= L"text/html";
 	static constexpr const wchar_t * application_json			= L"application/json";
-	static constexpr const wchar_t * application_xml			= L"application/xml";
+	static constexpr const wchar_t * application_xml				= L"application/xml";
 	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_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 * all_all						= L"*/*";
 	static constexpr const wchar_t * text_all					= L"text/*";
-	static constexpr const wchar_t * application_all			= L"application/*";
+	static constexpr const wchar_t * application_all				= L"application/*";
 
 	static constexpr const wchar_t * text_html_utf8				= L"text/html; charset=UTF-8";
 	static constexpr const wchar_t * application_json_utf8		= L"application/json; charset=UTF-8";
@@ -98,7 +98,7 @@ public:
 	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";
 
-	static constexpr const wchar_t * bearer 					= L"Bearer";
+	static constexpr const wchar_t * bearer						= L"Bearer";
 	static constexpr const wchar_t * winix 						= L"Winix";
 
 
@@ -114,8 +114,9 @@ public:
 	static const int status_403_forbidden = 403;
 	static const int status_404_not_found = 404;
 	static const int status_414_uri_too_long = 414;
+	static const int status_422_unprocessable_entity = 422;
 	static const int status_500_internal_server_error = 500;
-	static const int status_503_service_unavailale = 503;
+	static const int status_503_service_unavailable = 503;
 
 
 	static constexpr const wchar_t * str_status_200		= L"OK";
@@ -130,6 +131,7 @@ public:
 	static constexpr const wchar_t * str_status_403		= L"Forbidden";
 	static constexpr const wchar_t * str_status_404		= L"Not Found";
 	static constexpr const wchar_t * str_status_414		= L"URI Too Long";
+	static constexpr const wchar_t * str_status_422		= L"Unprocessable Entity";
 	static constexpr const wchar_t * str_status_500		= L"Internal Server Error";
 	static constexpr const wchar_t * str_status_503		= L"Service Unavailable";
 
@@ -163,8 +165,9 @@ protected:
 		{status_403_forbidden, str_status_403},
 		{status_404_not_found, str_status_404},
 		{status_414_uri_too_long, str_status_414},
+		{status_422_unprocessable_entity, str_status_422},
 		{status_500_internal_server_error, str_status_500},
-		{status_503_service_unavailale, str_status_503},
+		{status_503_service_unavailable, str_status_503},
 	};
 
 };