Last-Modified header is not being added in page response from dispatcher. | Community
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Umesh_Thakur
Community Advisor
Umesh_ThakurCommunity Advisor
Community Advisor
January 27, 2022
Question

Last-Modified header is not being added in page response from dispatcher.

  • January 27, 2022
  • 3 replies
  • 6064 views

Dear Members,

I was analysing the network call for a page, one very unique kind of issue I observed that is :

Not able to see the last-modified header for page content, for other type like dam, clientlibs fonts an all I can can the header in the same network call.

First I thought this my be the reason that publisher is not sending the header but when I see the *.html.h file, the last-modified header was present in the dispatcher cached file. sam as other types like dam n all.

I explicitly try to send the same response header thru. a custom filter but again no luck.

Try to see the behaviour after commenting all the Rewrite rules but agin no luck.

Note: there is no Header unset for those two headers either direct or conditional.

Same thing is working in my local dispatcher and apache .

Please suggest if anyone is having some thought about the root cause.

 

Thanks

Umesh Thakur

 

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    3 replies

    antoniom5495929
    antoniom5495929
    Level 7
    January 27, 2022

    Hi Umesh,

    are you sure that there's no CDN (like Akamai) on top of your dispatcher?

    Cause it could happens that Akamai it's configured only for dispatch some specific header (without last-modified).

     

    Let us know,

    Thanks,

    Antonio

      Umesh_Thakur
      Community Advisor
      Umesh_ThakurCommunity AdvisorAuthor
      Community Advisor
      January 28, 2022

      Thanks for your response Antonio.

      This is only for dispatcher there is no CDN involved.

       

      --Umesh Thakur

        antoniom5495929
        antoniom5495929
        Level 7
        January 28, 2022

        HI @umesh_thakur ,

        have you the possibility to perform a curl into the dispatcher server?

        You should try to execute from the dispatcher server the following curl:

        curl --head http://serverip/page-of-aem

        and check if head appears into this list.

         

        Based on the result we can be sure if the issue happens cause of a dispatcher configuration issue or not.

         

        Let us know.

        Thanks,

        Antonio

          milind_bachani
          Adobe Employee
          milind_bachaniAdobe Employee
          Adobe Employee
          January 27, 2022

          Hi @umesh_thakur ,

           

          Are there any headers listed under /cache /headers in the dispatcher ?

          /cache
     -/headers


          Thanks.

            Umesh_Thakur
            Community Advisor
            Umesh_ThakurCommunity AdvisorAuthor
            Community Advisor
            January 28, 2022

            Yes Milind, we have allowed caching for those headers and being cached as well but not appending as part of the response header. 

             

            Thanks for the response.

            Umesh Thakur

             

              joerghoh
              Adobe Employee
              joerghohAdobe Employee
              Adobe Employee
              January 28, 2022

              You need to enable "Header Caching" on the dispatcher, see https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en#caching-http-response-headers

               

              Jörg

                Umesh_Thakur
                Community Advisor
                Umesh_ThakurCommunity AdvisorAuthor
                Community Advisor
                January 29, 2022

                Thanks for the response @joerghoh ,

                It is already enabled and Last-Modified header is being cached as well but not appending in the response.

                I can see the header in as response header in other content type like dam assets, css n all but not able to see only for page content.

                We don’t have any rule written to unset the header for page content .

                Please guide

                Thanks

                Umesh Thakur

                  joerghoh
                  Adobe Employee
                  joerghohAdobe Employee
                  Adobe Employee
                  January 29, 2022

                  So to recap:

                  * In the dispatcher cache there is a page.html.h file present, containing the relevant header informatino.

                  * but when you request this page.html via curl from the dispatcher, these headers are not part of the response.

                   

                  In this case I would recommend to set the loglevel to 3 to get the maximum amount of logging and then redo the request. 

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