Last Modified Header Missing in Dispatcher for AEM Assets

[mohanmathka]

Hello
I’m facing an issue with AEM (Adobe Experience Manager) where the Last-Modified header appears when querying the publisher, but is missing when querying the dispatcher. Here are the details:

Publisher Request (Working)
root@ip pub:~# curl -I http://xx.x.xx-xxx:4503/content/dam/one/img/PCC+_IC_1.jpg
HTTP/1.1 200 OK
Date: Tue, 08 Apr 2025 18:07:46 GMT
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
Last-Modified: Fri, 10 Jan 2025 14:17:37 GMT
Content-Type: image/jpeg
Content-Length: 8381

Dispatcher Request (Missing Last-Modified)

root@ip Disp:~# curl -I http://xx.xx.xx-xxx/content/dam/one/img/PCC+_IC_1.jpg
HTTP/1.1 200 OK
Date: Tue, 08 Apr 2025 18:11:44 GMT
Server: Apache/2.4.52 (Ubuntu)
Age: 7003292
Accept-Ranges: bytes
Content-Length: 8381
Content-Type: image/jpeg

Issue: As shown in the example, the Last-Modified header is present in the response from the AEM publisher but is missing when accessed through the dispatcher.

Has anyone else experienced this? How can I resolve it so that the Last-Modified header is visible in the dispatcher response as well?

Thanks!

[Tethich · Accepted solution]

Hi @mohanmathka 

Maybe these resources on similar/same topic can help you out:
- https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/last-modified-header-is-no...
- https://experienceleague.adobe.com/en/docs/experience-manager-dispatcher/using/configuring/dispatche...
- https://experienceleague.adobe.com/en/docs/experience-cloud-kcs/kbarticles/ka-25892

[arunpatidar]

Hi @mohanmathka 

Please check Cache headers

https://experienceleague.adobe.com/en/docs/experience-manager-dispatcher/using/configuring/dispatche... 

[muskaanchandwani]

@mohanmathka Is it only absent for Assets or for HTML Pages as well?

[kautuk_sahni]

@mohanmathka Just checking in — were you able to resolve your issue?
We’d love to hear how things worked out. If the suggestions above helped, marking a response as correct can guide others with similar questions. And if you found another solution, feel free to share it — your insights could really benefit the community. Thanks again for being part of the conversation!