When I cancel my request from browser to a HTTP Trigger it does not cancel and continues execution when hosted on Azure.

My function example:

[FunctionName("Test")]
public async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)] HttpRequest req,
    CancellationToken cancellationToken,
    ILogger log)
{
    var allCancellationTokens = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, req.HttpContext.RequestAborted);

    await Task.Delay(30000, allCancellationTokens.Token);

    if (allCancellationTokens.IsCancellationRequested) {
        log.LogInformation("Request was cancelled!");
        return new StatusCodeResult(499);
    }

    return new OkObjectResult("Complete");
}

I have been testing the cancellation through Postman and axios cancel tokens. It works when I run the project locally and cancel it, but does not seem to cancel once it's published to azure.

My expected result would be that it throws an OperationCanceledException if I cancel the request during the await Task.Delay(30000, allCancellationTokens.Token); However when checking logs on Azure Functions, just seems to carry on execution and complete the function.

Steps to reproduce:

1. Create a HTTP Trigger like the one defined above.
2. Publish the app to Azure.
3. Open the functions logs on Azure in the monitor section.
4. Using Postman, send a request to this function and cancel the request (within the timeout period of 30 seconds).
5. Won't cancel the request and will still execute.