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Difference between rate-limit-by-key and rate-limit-by-subscription

Nagashree Balasundaram 741 Reputation points
2022-07-07T21:15:51.393+00:00

How are rate-limit-by-key and rate-limit-by-subscription handled differently in APIM. Per my understanding, every subscription is associated with a subscription id and a key. So how does it make a difference whether the counter is tracked based on the key or the subscriptionid.

Azure API Management
Azure API Management

An Azure service that provides a hybrid, multi-cloud management platform for APIs.

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  1. DanL 81 Reputation points Microsoft Employee
    2022-07-08T23:08:29.433+00:00

    @Nagashree Balasundaram - The rate-limit-by-key policy (despite its similar-sounding name) doesn't count based on a subscription key, but rather on a counter-key you define. For example, you might limit by a user ID, or the incoming IP address as in this example: 

       <rate-limit-by-key  calls="10"  
                 renewal-period="60"  
                 increment-condition="@(context.Response.StatusCode == 200)"  
                 counter-key="@(context.Request.IpAddress)"  
                 remaining-calls-variable-name="remainingCallsPerIP"/>

    Please let us know if this helps.

    Reference: https://learn.microsoft.com/azure/api-management/api-management-access-restriction-policies

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