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Caching policy

Azure API Management can be configured for response caching which can significantly reduce API latency, bandwidth consumption, and web service load for data that does not change frequently.

Using the Azure Management portal, navigate to the Colors API and set a caching policy for the Get random color call:

  • Press Add policy.

    APIM Adding Enable Caching

  • Select Cache responses.

    APIM Enable Caching

  • Set a caching duration of 15 seconds.

    Simple caching configuration is not yet implemented in the Azure Management portal. We shall see later how it can be done using policy expressions.

    APIM Cache Duration

  • Configure the Colors website from lab 3 to use the Unlimited subscription URL.
  • Select Start.
  • Notice that for each 15 second period the same color is set.

    Colors Website Caching

  • Looking at the Get Random color GET API policies in the Code View, you’ll see the caching policy defined:

    <policies>
        <inbound>
            <base />
            <cache-lookup vary-by-developer="false" vary-by-developer-groups="false" allow-private-response-caching="false" must-revalidate="false" downstream-caching-type="none" />
        </inbound>
        <backend>
            <base />
        </backend>
        <outbound>
            <base />
            <cache-store duration="15" />
        </outbound>
        <on-error>
            <base />
        </on-error>
    </policies>