Using HTTP Triggers

using System;
using System.IO;
using System.Net;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Extensions.OpenApi.Core.Attributes;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using Newtonsoft.Json;

namespace AzureFunctionApp
{
    public class Functions
    {
        private readonly ILogger<Functions> _logger;

        public Functions(ILogger<Functions> log)
        {
            _logger = log;
        }

        [FunctionName("Chatbot")]
        [OpenApiOperation(operationId: "Run", tags: new[] { "name" })]
        [OpenApiParameter(name: "name", In = ParameterLocation.Query, Required = true, Type = typeof(string), Description = "The name of the user")]
        [OpenApiResponseWithBody(statusCode: HttpStatusCode.OK, contentType: "text/plain", bodyType: typeof(string), Description = "Chat reply")]
        public async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "introduction")] HttpRequest req)
        {
            string name = req.Query["name"];

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

            var responseMessage = string.IsNullOrEmpty(name)
                ? "Hello. What is your name?"
                : $"Hello, {name}. What can I help you with?";

            return new OkObjectResult(responseMessage);
        }
    }
}