add headers content type

src/lib/server/api/index.ts

@@ -17,7 +17,11 @@ const prefix = `${base}/api/v2` as unknown as "";
 
 export const app = new Elysia({ prefix })
 	.mapResponse(({ response }) => {
-		return new Response(superjson.stringify(response));
+		return new Response(superjson.stringify(response), {
+			headers: {
+				"Content-Type": "application/json",
+			},
+		});
 	})
 	.use(
 		swagger({