FINERACT-2591: Log debug when Idempotency-Key header is missing

Author: Dishita Suyal

fineract-core/src/main/java/org/apache/fineract/infrastructure/core/filters/IdempotencyStoreFilter.java

@@ -48,6 +48,17 @@ public class IdempotencyStoreFilter extends OncePerRequestFilter {
     protected void doFilterInternal(@NonNull HttpServletRequest request, @NonNull HttpServletResponse response,
             @NonNull FilterChain filterChain) throws ServletException, IOException {
         Mutable<ContentCachingResponseWrapper> wrapper = new MutableObject<>();
+        String headerName = fineractProperties.getIdempotencyKeyHeaderName();
+        String idempotencyKey = request.getHeader(headerName);
+
+        if (headerName != null && !headerName.isBlank() &&
+                (idempotencyKey == null || idempotencyKey.isBlank())) {
+
+            log.debug("Missing {} for request: {} {}",
+                    headerName,
+                    request.getMethod(),
+                    request.getRequestURI());
+        }
         if (helper.isAllowedContentTypeRequest(request)) {
             wrapper.setValue(new ContentCachingResponseWrapper(response));
         }