Policy to Avoid duplicate https calls on an Azure Api endpoint - azure

Question

I have some troubles regarding some duplicate calls on my Azure Api Endpoint. For example, I see that my endpoint :
tennis/getballs
has been called twice
First : 2020-11-02T18:07:19.8261667Z
Second :2020-11-02T18:07:19.881239Z
I want to avoid this second call which has the same payload (like "I don't do this call because it's too close than the first call", it's ok if it's 5 seconds later). I'm looking for something with the Policy but I didn't find something interesting.

Answer 1

Accourding to your description, maybe you want to add rate limit to your api. I think this document will help you.
This part describes how to prevent your api being called within short time. You can modify the policy to meet your custom request.
Enter api management webpage then select your target API > All operations > Design.
In the Inbound processing section, select the code editor (</>) icon.
Position the cursor inside the element and select Show snippets at the top right corner.
In the right window, under Access restriction policies, select + Limit call rate per key.
Modify your rate-limit-by-key code (in the element) to the following code:
calls="3" renewal-period="15" means you can call this api no more than 3 times within 15 seconds.
enter image description here
<policies>
<inbound>
<rate-limit-by-key calls="3" renewal-period="15" counter-key="#(context.Subscription.Id)" />
<base />
</inbound>
<backend>
<base />
</backend>
<outbound>
<set-header name="X-Powered-By" exists-action="delete" />
<set-header name="X-AspNet-Version" exists-action="delete" />
<redirect-content-urls />
<base />
</outbound>
<on-error>
<base />
</on-error>
</policies>
After editing, you can call your api then you will find 429 Too many requests when calling too many times as your configuration.