From 5bcd59e6fd4baa3a900b35f06e380e414e293dcc Mon Sep 17 00:00:00 2001
From: Divyansh Choudhary <divyanshchoudhary99@gmail.com>
Date: Sat, 26 Mar 2022 20:35:57 +0530
Subject: [PATCH] Add `max-age` Cache-Control header to kernel logos

Issue: #702
---
 jupyter_server/kernelspecs/handlers.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/jupyter_server/kernelspecs/handlers.py b/jupyter_server/kernelspecs/handlers.py
index 437670d90a..8c4a46052c 100644
--- a/jupyter_server/kernelspecs/handlers.py
+++ b/jupyter_server/kernelspecs/handlers.py
@@ -19,6 +19,8 @@ def initialize(self):
     @authorized
     def get(self, kernel_name, path, include_body=True):
         ksm = self.kernel_spec_manager
+        if path.lower().endswith(".png"):
+            self.set_header("Cache-Control", "max-age=1000")
         try:
             self.root = ksm.get_kernel_spec(kernel_name).resource_dir
         except KeyError as e: