Example of creating cookies inside a Azure Function

azurefunctions.cookies.cshtml

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;

namespace FunctionCookieExample
{
    public static class MyFunction
    {
        [FunctionName("MyFunction")]
        public static IActionResult Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)] HttpRequest req)
        {
            // Read a cookie
            var cookieValue = req.Cookies["MyCookie"];

            // Set a cooke

            //// Configure the cookie
            CookieOptions option = new CookieOptions();
            option.Expires = DateTime.Now.AddYears(1);
            option.Domain = ".mydomain.tld";
            //// Make the cookie available for the browser
            option.HttpOnly = true;

            //// A little non logical way to actually get the HttpResponse (from the HttpRequest and its HttpContext)
            req.HttpContext.Response.Cookies.Append("MyCookie", "MyValue", option);

            return new OkObjectResult("Cookie set");
        }
    }
}

Thanks a lot!

Does it work to set any arbitrary custom domain name as you've done here with .mydomain.tld? Is any configuration required in the Azure side of things to create cookies under custom domains?

@SikoSoft it needs at least to be the (custom) tld domain the function is working in. Browsers don’t allow you to set cookies from other domains.

Yes, thank you. ChatGPT fell apart on this one.