core: handle image download cache

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.17.5",
+  "version": "4.17.6",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/utils/request.js

@@ -9,6 +9,9 @@ const request = {
       $
         .ajax({
           dataType: 'json',
+          headers: {
+            Accept: 'application/json',
+          },
           ...options,
         })
         .fail((jqXHR, textStatus, errorThrown) => {