diff --git src/webserver.cpp src/webserver.cpp
index a3104e9..5ae7381 100644
--- src/webserver.cpp
+++ src/webserver.cpp
@@ -676,6 +676,14 @@ int webserver::finalize_answer(
         {
             if(hrm->is_allowed(method))
             {
+                // NOTE: Here 'MHD_destroy_post_processor' is required for performing a final 'post_process'
+                // of the 'URL Encode'. This ensures ensures the processing of final key without value left
+                // at the end of the buffer. See function internal doc at 'postprocessor.c'.
+                if (mr->pp != NULL) {
+                    MHD_destroy_post_processor(mr->pp);
+                    mr->pp = NULL;
+                }
+
                 mr->dhrs = ((hrm)->*(mr->callback))(*mr->dhr); //copy in memory (move in case)
                 if (mr->dhrs->get_response_code() == -1)
                 {