How to Idenify/filter which client(multiple Mobile & web requests) is calling to an API hosted on Azure(App Service possibly) ?

Question

This is about reusable API. Is this achievable through API Management or some other service like Front Door etc.

Answer 1

Hi @SidK ,

Thanks for reaching out to Q&A.

If you integrate APIM in front of app service, APIM maintains Client IP through context variable as follows: context.Request.IpAddress

The Client IP needs to be passed along to the App service by way of defining a header via a small policy snippet:

<set-header name="X-Forwarded-Client-Ip" exists-action="override">
<value>@(context.Request.IpAddress)</value>
</set-header>

The corresponding value then can be accessed in the app service code HttpRequest object as follows:

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
....

var clientIP = req.Headers["X-Forwarded-Client-Ip"];  
....  

}

I hope using the client ip you will be able to figure out the client app. Feel free to reach out to me if you have any queries or concerns.

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