public static class Function1
{
    [FunctionName("function1")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {
        log.LogInformation("C# HTTP trigger function processed a request.");

        string firstName = req.Query["firstName"];

        string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
        dynamic data = JsonConvert.DeserializeObject(requestBody);
        firstName = firstName ?? data?.firstName;

        string responseMessage = string.IsNullOrEmpty(firstName) || string.IsNullOrEmpty(lastName)
            ? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
            : $"Hello, {firstName}. This HTTP triggered function executed successfully.";

        return new OkObjectResult(responseMessage);
    }
}