diff --git a/httpd/httpdespfs.c b/httpd/httpdespfs.c
index 9321aad..ea443d1 100644
--- a/httpd/httpdespfs.c
+++ b/httpd/httpdespfs.c
@@ -13,6 +13,7 @@ Connector to let httpd use the espfs filesystem to serve the files in it.
  * ----------------------------------------------------------------------------
  */
 #include "httpdespfs.h"
+#include "web-server.h"
 
 // The static files marked with FLAG_GZIP are compressed and will be served with GZIP compression.
 // If the client does not advertise that he accepts GZIP send following warning message (telnet users for e.g.)
@@ -29,6 +30,14 @@ cgiEspFsHook(HttpdConnData *connData) {
 	char acceptEncodingBuffer[64];
 	int isGzip;
 
+	int urlLen = os_strlen(connData->url);
+	if( urlLen > 5 )
+	{
+		if( os_strcmp( connData->url+urlLen-5, ".json" ) == 0 )
+		{
+			return webServerProcessJsonQuery(connData);
+		}
+	}
 	//os_printf("cgiEspFsHook conn=%p conn->conn=%p file=%p\n", connData, connData->conn, file);
 
 	if (connData->conn==NULL) {
diff --git a/web-server/web-server.c b/web-server/web-server.c
index 0d83eb5..862436e 100644
--- a/web-server/web-server.c
+++ b/web-server/web-server.c
@@ -2,6 +2,7 @@
 
 #include "espfs.h"
 #include "config.h"
+#include "cgi.h"
 
 char * webServerPages = NULL;
 
@@ -21,7 +22,7 @@ void ICACHE_FLASH_ATTR webServerBrowseFiles()
 		espFsIteratorInit(userPageCtx, &it);
 		while( espFsIteratorNext(&it) )
 		{
-			int nlen = strlen(it.name);
+			int nlen = os_strlen(it.name);
 			if( nlen >= 6 )
 			{
 				if( os_strcmp( it.name + nlen-5, ".html" ) == 0 )
@@ -50,7 +51,7 @@ void ICACHE_FLASH_ATTR webServerBrowseFiles()
 					os_strcat(buffer, "\"");
 				}
 			}
-			if( strlen(buffer) > 600 )
+			if( os_strlen(buffer) > 600 )
 				break;
 		}
 	}
@@ -58,7 +59,7 @@ void ICACHE_FLASH_ATTR webServerBrowseFiles()
 	if( webServerPages != NULL )
 		os_free( webServerPages );
 	
-	int len = strlen(buffer) + 1;
+	int len = os_strlen(buffer) + 1;
 	webServerPages = (char *)os_malloc( len );
 	os_memcpy( webServerPages, buffer, len );
 }
@@ -73,3 +74,9 @@ void ICACHE_FLASH_ATTR webServerInit()
 	webServerBrowseFiles();
 }
 
+int ICACHE_FLASH_ATTR webServerProcessJsonQuery(HttpdConnData *connData)
+{
+	os_printf("URL: %s\n", connData->url);
+	errorResponse(connData, 400, "Slip protocol is not enabled!");
+	return HTTPD_CGI_DONE;
+}
diff --git a/web-server/web-server.h b/web-server/web-server.h
index 7716b33..2fdd236 100644
--- a/web-server/web-server.h
+++ b/web-server/web-server.h
@@ -3,9 +3,13 @@
 
 #include <esp8266.h>
 
+#include "httpd.h"
+
 void   webServerInit();
 
 char * webServerUserPages();
 
+int    webServerProcessJsonQuery(HttpdConnData *connData);
+
 #endif /* WEB_SERVER_H */