fix(handler): update Content-Range headers for API response

* change Content-Range format to include 'items'
* add X-Api-Range-From and X-Api-Modelname headers
* add X-Api-Range-Etotal header for total filtered items

pkg/restheadspec/handler.go

@@ -2711,9 +2711,12 @@ func (h *Handler) sendFormattedResponse(w common.ResponseWriter, data interface{
 	}
 
 	w.SetHeader("Content-Type", "application/json")
-	w.SetHeader("Content-Range", fmt.Sprintf("%d-%d/%d", metadata.Offset, int64(metadata.Offset)+metadata.Count, metadata.Filtered))
+	w.SetHeader("Content-Range", fmt.Sprintf("items %d-%d/%d", metadata.Offset, int64(metadata.Offset)+metadata.Count, metadata.Filtered))
 	w.SetHeader("X-Api-Range-Total", fmt.Sprintf("%d", metadata.Filtered))
 	w.SetHeader("X-Api-Range-Size", fmt.Sprintf("%d", metadata.Count))
+	w.SetHeader("X-Api-Range-From", fmt.Sprintf("%d", metadata.Offset))
+	w.SetHeader("X-Api-Range-Etotal", fmt.Sprintf("%d", metadata.Filtered))
+	w.SetHeader("X-Api-Modelname", tableName)
 
 	// Format response based on response format option
 	switch options.ResponseFormat {

pkg/restheadspec/headers.go

@@ -225,12 +225,13 @@ func (h *Handler) parseOptionsFromHeaders(r common.Request, model interface{}) E
 			limitValueParts := strings.Split(limitValue, ",")
 
 			if len(limitValueParts) > 1 {
-				if offset, err := strconv.Atoi(limitValueParts[0]); err == nil {
-					options.Offset = &offset
-				}
-				if limit, err := strconv.Atoi(limitValueParts[1]); err == nil {
+				if limit, err := strconv.Atoi(limitValueParts[0]); err == nil {
 					options.Limit = &limit
 				}
+				if offset, err := strconv.Atoi(limitValueParts[1]); err == nil {
+					options.Offset = &offset
+				}
+
 			} else {
 				if limit, err := strconv.Atoi(limitValueParts[0]); err == nil {
 					options.Limit = &limit