From 78521ab27854df6eaf6d9807b4c8375fb0367143 Mon Sep 17 00:00:00 2001
From: Divyansh Choudhary <divyanshchoudhary99@gmail.com>
Date: Wed, 30 Mar 2022 01:59:34 +0530
Subject: [PATCH] Add `max-age` Cache-Control header to kernel logos (#760)

---
 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 5e0ace1704..3ac8506a31 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", f"max-age={60*60*24*30}")
         try:
             self.root = ksm.get_kernel_spec(kernel_name).resource_dir
         except KeyError as e: