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pavanr6387218
Level 2
May 15, 2018

Dispatcher Configuration to Cache Servlet Requests

  • May 15, 2018
  • 4 replies
  • 8684 views

Hi,

We have a requirement where in  we want to cache the servlet(AEM) response.

Servlet is making a REST call to third party to fetch a response which is constant(response remains same)

Response of the servlet to be cached:

Servlet :  /bin/servletpathname?queryParam=apiurl.

From clientside, we are making an ajax call to /bin/servletpathaname/apiurl/a.html (a.html is being appended so that the request has an extension.).

At Dispatcher We

are using internal redirect to redirect /bin/servletpathaname/apiurl/a.html  to /bin/servletpathname?queryParam=apiurl.

We are able to get a successful response back from servlet (Internal Redirect is successful). But at dispatcher we observe that the request is not getting cached.

Am I missing something?

I want to understand how can we cache the servlet response, this would greatly reduce the load on the end server and improve performance.

Dispatcher:

  • The request is a GET request
  • We have appended extension for the primary request.
  • No Query Param in the initial request
  • There is no authorization.

Dispatcher.any:

/rules
  {
    /0000  {  /glob "*"   /type "allow" }
  }
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4 replies

akhoury
Adobe Employee
akhouryAdobe Employee
Adobe Employee
May 15, 2018

> At Dispatcher We are using internal redirect to redirect /bin/servletpathaname/apiurl/a.html  to /bin/servletpathname?queryParam=apiurl.

That will not make the request cacheable unfortunately, dispatcher will not cache 301 or 302 redirects or requests that it must send with a querystring.  Even though you are rewriting this or redirecting this at the Apache level you cannot cache it in dispatcher unless you create a mapping in AEM that maps from /bin/servletpathaname/apiurl/a.html  to /bin/servletpathname?queryParam=apiurl.  Alternatively, you could cache these requests at the CDN level.  Many CDNs do allow caching of requests with querystrings.

akhoury
Adobe Employee
akhouryAdobe Employee
Adobe Employee
May 15, 2018

Note: The request received by Apache here is the /bin/servletpathaname/apiurl/a.html one, but the request being received and sent by the dispatcher module within apache has the querystring: /bin/servletpathname?queryParam=apiurl

VitthalaShiva
VitthalaShiva
Level 2
May 16, 2018

Can u create a servlet with the resouceType instead of path.

This will help u to cache the request on dispatcher and also just create a nide under /etc whose resource type will be ur servlet.

Let me know if this works.

    P
    pavanr6387218Author
    Level 2
    May 17, 2018

    Resoruce Type would not be an option as the apiurl will be authored.

    P
    pavankumarn993-1
    May 16, 2018

    Hi , Since in your case getting the same response always ,

    Instead of using query params, you can also try selectors like /bin/servletpathaname/a.apiurl.html in Ajax call. Later you can read this selector in servlet , by this you can cache the response.

    V
    vikask76191633
    December 18, 2018

    Is this question answered ? As I am also trying to do something similar however I am trying to cache service response.

    URL: domain:port/services/servicename/apiname

    This URL is a calls AEM servlet internally using httpclient and bring tons of data in json format, (static data).  Since it is taking a minute or more to return the response, I want to cache it at dispatcher.

    How I can proceed with ?

    Regards

    Vikas

    A
    aem-enthu27
    Level 4
    January 2, 2023

    @pavanr6387218  is it resolved if yes how did you resolve did you replace query param with selectors?

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