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DataPower Cache using Stylesheet

  • 1.  DataPower Cache using Stylesheet

    Posted Fri January 15, 2021 02:42 PM

    Hi there,

    I am trying to dynamically create cache policy in request URL before calling DP url open. This is to cache json response of POST request.

    I am trying below code in my stylesheet before making dp url open call.

    But it is not caching the response, However If i put it in xml manager cache policy, i can see cache entry in document status.

    Code-:

    <xsl:variable name="cachePolicy"> <allowCompression>on</allowCompression> <dcp:caching-policies xmlns:dcp="http://www.datapower.com/schemas/caching"> <dcp:caching-policy url-match="{$endpoint}" priority="128"> <dcp:fixed ttl="{$cachetime}" cache-backend-response="true" http-cache-validation="false" return-expired-document="false" restful-invalidation="false" cache-post-put-response="true" /> </dcp:caching-policy> </dcp:caching-policies> ' </xsl:variable> <dp:set-variable name="'var://service/mpgw/backend-config'" value="$cachePolicy" /> <xsl:variable name="response"> <dp:url-open target="{$endpoint}" http-method="post" http-headers="$headerValues" content-type="application/x-www-form-urlencoded" timeout="60" response="responsecode-binary" data-type="json"> <xsl:value-of select="$body" /> </dp:url-open> </xsl:variable>

    Can you please guide me what I am missing here.

    Many thanks



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  • 2.  RE: DataPower Cache using Stylesheet
    Best Answer

    Posted Tue January 19, 2021 01:17 PM

    Hi,

    few things stand out. The service variable var://service/mpgw/backend-config is wrong. It seems that there is an error in IBM Knowledge Center documentation. The correct variable is var://service/cache/dynamic-policies. If set the variable in the same stylesheet in which you are making the url-open call it doesn't work. Create another xform action before the url-open action and set the variable there.

    Also remove allowCompression element. That is part of backend-config definition, not a part of dynamic-policies.

    And if you want to cache POST/PUT responses, you'd probably want to set x-dp-cache-key header in your url-open request.

    --HP



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  • 3.  RE: DataPower Cache using Stylesheet
    Best Answer

    Posted Wed January 20, 2021 09:40 AM

    Hey HP,


    Thanks for you reply. Your given variable works now.


    I had added allowCompression because backend-config require it, without this it was given error.


    Many Thanks.








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    #Support
    #SupportMigration


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