fix: bug on form data with slices (#4040)

rest/httpx/util.go

@@ -21,15 +21,9 @@ func GetFormValues(r *http.Request) (map[string]any, error) {
 
 	params := make(map[string]any, len(r.Form))
 	for name := range r.Form {
-		switch len(r.Form[name]) {
-		case 1:
-			formValue := r.Form.Get(name)
-			if len(formValue) > 0 {
-				params[name] = formValue
-			}
-		default:
-			// len(r.Form[name]) > 1, never be 0
-			params[name] = r.Form[name]
+		formValue := r.Form.Get(name)
+		if len(formValue) > 0 {
+			params[name] = formValue
 		}
 	}