HookApiRequestActivity.cs

[FunctionName(nameof(HookApiRequestActivity))]
public static async Task<string> HookApiRequestActivity(
    [ActivityTrigger] int requestValue
    )
{
    var url = $"{ConfigurationManager.AppSettings["HookUrl"]}?Value={requestValue}";
    ServicePointManager.DefaultConnectionLimit = 100;
    using (var client = new HttpClient())
    {
        var result = await client.GetStringAsync(url);
        return result.Replace("\"", "");
    }
}