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

namespace FunctionRestApi
{
    public static class Function1
    {
        [FunctionName("Function1")]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
    {

            var httpWebRequest = (HttpWebRequest)WebRequest.Create("URL_with_client_id_authorization_token");
            httpWebRequest.ContentType = "application/json";

            httpWebRequest.Method = "GET";

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
               var result = streamReader.ReadToEnd();
               log.LogInformation(result);
            }

            return new OkObjectResult(value: httpWebRequest);
      }
   }
 }

I am new to azure function. This code works when I am just using 'GET' method. But if I want to use 'POST' method with request body data i.e. date range (start_date and end_date) and some other sub_user_id, then how can I do that?