diff --git a/winixd/core/app.cpp b/winixd/core/app.cpp
index 0f53069..7cf7a7c 100644
--- a/winixd/core/app.cpp
+++ b/winixd/core/app.cpp
@@ -1293,18 +1293,17 @@ void App::ReadInputPostToBuffer()
 	const int buffer_len = sizeof(buffer) / sizeof(char) - 1;
 	int read_len;
 
-	post_buffer.clear();
-	post_buffer.reserve(1024 * 1024 * 5); // IMPROVEME add to config?
+	cur.request->raw_post.clear();
+	cur.request->raw_post.reserve(1024 * 1024 * 5); // IMPROVEME add to config?
 
 	do
 	{
 		read_len = FCGX_GetStr(buffer, buffer_len, cur.request->fcgi_request.in);
 
 		if( read_len > 0 )
-			post_buffer.write(buffer, read_len);
+			cur.request->raw_post.write(buffer, read_len);
 	}
 	while( read_len == buffer_len );
-
 }
 
 
@@ -1317,7 +1316,7 @@ void App::ParsePostJson()
 	space_parser.set_all_items_limit(    (fun && fun->post_max_all_items != 0) ?      fun->post_max_all_items      : config.post_max_all_items);
 	space_parser.set_nested_level_limit( (fun && fun->post_max_nested_objects != 0) ? fun->post_max_nested_objects : config.post_max_nested_objects);
 
-	pt::SpaceParser::Status parse_status = space_parser.parse_json(post_buffer, cur.request->post_in);
+	pt::SpaceParser::Status parse_status = space_parser.parse_json(cur.request->raw_post, cur.request->post_in);
 
 	if( parse_status == pt::SpaceParser::ok )
 	{
@@ -1362,13 +1361,13 @@ void App::ParsePostJson()
 }
 
 
-void App::ReadPostJson()
+void App::ReadPostJson(bool copy_raw_post)
 {
 	ReadInputPostToBuffer();
 
-	if( !post_buffer.empty() )
+	if( !cur.request->raw_post.empty() )
 	{
-		if( config.post_json_max == 0 || post_buffer.size() <= config.post_json_max )
+		if( config.post_json_max == 0 || cur.request->raw_post.size() <= config.post_json_max )
 		{
 			ParsePostJson();
 		}
@@ -1378,7 +1377,8 @@ void App::ReadPostJson()
 			cur.request->http_status = Header::status_400_bad_request;
 		}
 
-		post_buffer.clear();
+		if( !copy_raw_post )
+			cur.request->raw_post.clear();
 	}
 	else
 	{
@@ -1392,28 +1392,30 @@ void App::ReadPostVars()
 	if( cur.request->method == Request::post || cur.request->method == Request::put ||
 		cur.request->method == Request::patch || cur.request->method == Request::delete_ )
 	{
+		bool copy_raw_post = (cur.request->function && cur.request->function->NeedToCopyRawPost());
+
 		if( pt::is_substr_nc(Header::multipart_form_data, cur.request->env_content_type.c_str()) )
 		{
 			log << log3 << "App: content type: " << Header::multipart_form_data << logend;
-			post_multi_parser.Parse(cur.request->fcgi_request.in, *cur.request); // IMPROVEME add checking for return status
+			post_multi_parser.Parse(cur.request->fcgi_request.in, *cur.request, copy_raw_post); // IMPROVEME add checking for return status
 		}
 		else
 		if( pt::is_substr_nc(Winix::Header::application_json, cur.request->env_content_type.c_str()) )
 		{
 			log << log3 << "App: content type: " << Winix::Header::application_json << ", using json parser" << logend;
-			ReadPostJson();
+			ReadPostJson(copy_raw_post);
 		}
 		else
 		if( pt::is_substr_nc(Header::application_x_www_form_urlencoded, cur.request->env_content_type.c_str()) )
 		{
 			log << log3 << "App: content type: " << Winix::Header::application_x_www_form_urlencoded << logend;
-			post_parser.Parse(cur.request->fcgi_request.in, *cur.request); // IMPROVEME add checking for return status
+			post_parser.Parse(cur.request->fcgi_request.in, *cur.request, copy_raw_post); // IMPROVEME add checking for return status
 		}
 		else
 		if( cur.request->env_content_type.empty() )
 		{
 			log << log2 << "App: Content-Type header is not set or is empty, I try to parse as " << Header::application_x_www_form_urlencoded << logend;
-			post_parser.Parse(cur.request->fcgi_request.in, *cur.request); // IMPROVEME add checking for return status
+			post_parser.Parse(cur.request->fcgi_request.in, *cur.request, copy_raw_post); // IMPROVEME add checking for return status
 		}
 		else
 		{
diff --git a/winixd/core/app.h b/winixd/core/app.h
index 08bc51e..47e6889 100644
--- a/winixd/core/app.h
+++ b/winixd/core/app.h
@@ -128,7 +128,6 @@ private:
 	PostParser post_parser;
 	PostMultiParser post_multi_parser;
 	pt::SpaceParser space_parser;
-	pt::TextStream post_buffer;
 
 	CookieParser cookie_parser;
 	AcceptBaseParser accept_base_parser;
@@ -200,7 +199,7 @@ private:
 	bool SaveEnvHTTPVariable(const char * env);
 	void ReadInputPostToBuffer();
 	void ParsePostJson();
-	void ReadPostJson();
+	void ReadPostJson(bool copy_raw_post);
 	void ReadPostVars();
 	void CheckIE();
 	void CheckKonqueror();
diff --git a/winixd/core/pluginmsg.h b/winixd/core/pluginmsg.h
index 12697bf..04359fd 100644
--- a/winixd/core/pluginmsg.h
+++ b/winixd/core/pluginmsg.h
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -282,20 +282,6 @@ namespace Winix
 // the session pointer in info is null
 #define WINIX_BASE_URL_REDIRECT				31030
 
-// raw POST parameters
-// in p1 there is a pointer to std::wstring meaning a parameter's name
-// in p2 there is a pointer to std::wstring value
-// this is sent only from PostParser
-// PostMultiParser (multipart/form-data html forms) doesn't send this messsage
-// there is no a session set (session pointer is null)
-// this message is sent for each name value pairs
-//
-#define WINIX_POST_PARAMS					31040
-
-// this is the raw string sent in POST method
-// in p1 there is a pointer to std::string object
-#define WINIX_RAW_POST_STRING				31050
-
 // this message is sent before calling MakePost() or MakeGet()
 // if you return false (which is default) you can prevent the access
 // to the resource
diff --git a/winixd/core/postmultiparser.cpp b/winixd/core/postmultiparser.cpp
index 3bab06b..20466fa 100644
--- a/winixd/core/postmultiparser.cpp
+++ b/winixd/core/postmultiparser.cpp
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2021, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -558,6 +558,9 @@ void PostMultiParser::ReadChar()
 	
 		in_buffer_len = FCGX_GetStr((char*)in_buffer, WINIX_POSTMULTI_INPUT_BUFFER, in);
 		in_buffer_ind = 0;
+
+		if( copy_raw_post && in_buffer_len > 0 )
+			request->raw_post.write((char *)in_buffer, in_buffer_len);
 	}
 
 	if( in_buffer_len == 0 )
@@ -574,7 +577,7 @@ void PostMultiParser::ReadChar()
 
 
 
-Error PostMultiParser::Parse(FCGX_Stream * in_, Request & request)
+Error PostMultiParser::Parse(FCGX_Stream * in_, Request & request, bool copy_raw_post)
 {
 	in   = in_;
 	last = 0;
@@ -584,6 +587,7 @@ Error PostMultiParser::Parse(FCGX_Stream * in_, Request & request)
 	in_buffer_ind   = WINIX_POSTMULTI_INPUT_BUFFER;
 	in_buffer_len   = WINIX_POSTMULTI_INPUT_BUFFER;
 	this->request = &request;
+	this->copy_raw_post = copy_raw_post;
 	tmp_filename_postfix = 1;
 
 	ReadChar();
diff --git a/winixd/core/postmultiparser.h b/winixd/core/postmultiparser.h
index da8d584..302ebca 100644
--- a/winixd/core/postmultiparser.h
+++ b/winixd/core/postmultiparser.h
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -66,7 +66,7 @@ public:
 	~PostMultiParser();
 
 	void SetConfig(Config * pconfig);
-	Error Parse(FCGX_Stream * in_, Request & request);
+	Error Parse(FCGX_Stream * in_, Request & request, bool copy_raw_post);
 
 private:
 
@@ -80,6 +80,7 @@ private:
 	int tmp_filename_postfix;
 	size_t in_buffer_ind;
 	size_t in_buffer_len;
+	bool copy_raw_post;
 
 	Request * request;
 
diff --git a/winixd/core/postparser.cpp b/winixd/core/postparser.cpp
index ab2a5ea..d8bc910 100644
--- a/winixd/core/postparser.cpp
+++ b/winixd/core/postparser.cpp
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2022, Tomasz Sowa
+/*
+ * Copyright (c) 2022-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -36,7 +36,6 @@
 #include <string>
 #include "postparser.h"
 #include "httpsimpleparser.h"
-#include "utf8/utf8.h"
 #include "convert/text.h"
 
 
@@ -57,22 +56,15 @@ void PostParser::LogValueSize(size_t s)
 }
 
 
-void PostParser::Parse(FCGX_Stream * in, Request & request)
+void PostParser::Parse(FCGX_Stream * in, Request & request, bool copy_raw_post)
 {
 	this->in = in;
 	this->request = &request;
+	this->copy_raw_post = copy_raw_post;
 	var_index = 1;
-	raw_post.clear();
-
-	has_winix_post_params_msg = plugin->HasMessage(WINIX_POST_PARAMS);
-	has_winix_raw_post_msg    = plugin->HasMessage(WINIX_RAW_POST_STRING);
+	this->request->raw_post.clear();
 
 	HttpSimpleParser::Parse();
-
-	if( has_winix_raw_post_msg )
-		plugin->Call(WINIX_RAW_POST_STRING, &raw_post);
-
-	raw_post.clear();
 }
 
 
@@ -80,10 +72,10 @@ int PostParser::GetChar()
 {
 	int c = FCGX_GetChar(in);
 
-	if( c != -1 && has_winix_raw_post_msg )
-		raw_post += c;
+	if( c != -1 && copy_raw_post )
+		request->raw_post << static_cast<unsigned char>(c);
 
-return c;
+	return c;
 }
 
 
@@ -110,21 +102,13 @@ void PostParser::CreateLog(bool param_added, const std::wstring & name, const st
 }
 
 
-
 void PostParser::Parameter(std::wstring & name, std::wstring & value)
 {
-	if( has_winix_post_params_msg )
-		plugin->Call(WINIX_POST_PARAMS, &name, &value);
-
 	bool added = request->AddPostVar(name, value);
 	CreateLog(added, name, value);
 }
 
 
 
-
-
-
-
 } // namespace Winix
 
diff --git a/winixd/core/postparser.h b/winixd/core/postparser.h
index 92445c0..ed996a5 100644
--- a/winixd/core/postparser.h
+++ b/winixd/core/postparser.h
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -52,7 +52,7 @@ public:
 
 	PostParser();
 	void LogValueSize(size_t s);
-	void Parse(FCGX_Stream * in, Request & request);
+	void Parse(FCGX_Stream * in, Request & request, bool copy_raw_post);
 
 
 protected:
@@ -61,9 +61,7 @@ protected:
 	Request * request;
 	size_t log_value_size;
 	int var_index;
-	bool has_winix_post_params_msg;
-	bool has_winix_raw_post_msg;
-	std::string raw_post;
+	bool copy_raw_post;
 
 	virtual int GetChar();
 	void CreateLog(bool param_added, const std::wstring & name, const std::wstring & value);
diff --git a/winixd/core/request.cpp b/winixd/core/request.cpp
index c368d9b..43baf7e 100644
--- a/winixd/core/request.cpp
+++ b/winixd/core/request.cpp
@@ -264,6 +264,7 @@ void Request::Clear()
 	cookie_id_string.clear();
 	send_data_buf.clear();
 	http_header_name.clear();
+	raw_post.clear();
 }
 
 
diff --git a/winixd/core/request.h b/winixd/core/request.h
index 08d8a99..40e1b39 100644
--- a/winixd/core/request.h
+++ b/winixd/core/request.h
@@ -180,6 +180,11 @@ public:
 	CookieTab   cookie_tab;
 	pt::Space	post_in;
 
+	/*
+	 * raw post input used if a Function::NeedToCopyRawPost() returned true
+	 */
+	pt::TextStream raw_post;
+
 	// input headers (without cookies)
 	// at the moment we are using FastCGI and HTTP headers are prefixed with 'HTTP_' string
 	// so we drop the prefix and change all characters to small ones
diff --git a/winixd/functions/functionbase.cpp b/winixd/functions/functionbase.cpp
index 6294467..7ca1c87 100644
--- a/winixd/functions/functionbase.cpp
+++ b/winixd/functions/functionbase.cpp
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2010-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2010-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -524,6 +524,11 @@ void FunctionBase::ContinueMakePatch()
 	// do nothing by default
 }
 
+bool FunctionBase::NeedToCopyRawPost()
+{
+	return false;
+}
+
 
 } // namespace Winix
 
diff --git a/winixd/functions/functionbase.h b/winixd/functions/functionbase.h
index 7750b8a..2998c3e 100644
--- a/winixd/functions/functionbase.h
+++ b/winixd/functions/functionbase.h
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2010-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2010-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -167,6 +167,7 @@ public:
 	//void SetSynchro(Synchro * psynchro);
 	//void SetSessionManager(SessionManager * pmanager);
 
+	virtual bool NeedToCopyRawPost();
 
 protected: