A simple C# script for making HTTP Request on Unity

Request.cs

using System;
using System.Collections;
using System.Text;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;

namespace Project.Base
{
    public static class Request
    {
        public static IEnumerator post(string routeName, dynamic data, Action<Response> handleResponse)
        {
            using (UnityWebRequest request = new UnityWebRequest($"http://localhost:8000/{handleRouteName(routeName)}", "POST"))
            {
                string jsonFields = JsonUtility.ToJson(data);

                request.uploadHandler = new UploadHandlerRaw(Encoding.UTF8.GetBytes(jsonFields));
                request.downloadHandler = new DownloadHandlerBuffer();
                request.SetRequestHeader("Content-Type", "application/json");
                request.SetRequestHeader("Accept", "application/json");

                yield return request.SendWebRequest();

                Response apiReponse = JsonUtility.FromJson<Response>(request.downloadHandler?.text);

                handleResponse(apiReponse);
            }
        }
        
        public static IEnumerator get(string routeName, Action<Response> handleResponse)
        {
            using (UnityWebRequest request = new UnityWebRequest($"http://localhost:8000/{handleRouteName(routeName)}", "GET"))
            {
                request.downloadHandler = new DownloadHandlerBuffer();
                request.SetRequestHeader("Content-Type", "application/json");
                request.SetRequestHeader("Accept", "application/json");

                yield return request.SendWebRequest();

                Response apiReponse = JsonUtility.FromJson<Response>(request.downloadHandler?.text);

                handleResponse(apiReponse);
            }
        }

        public static IEnumerator put(string routeName, dynamic data, Action<Response> handleResponse = null)
        {
            using (UnityWebRequest request = new UnityWebRequest($"http://localhost:8000/{handleRouteName(routeName)}", "PUT"))
            {
                string jsonFields = JsonUtility.ToJson(data);

                request.uploadHandler = new UploadHandlerRaw(Encoding.UTF8.GetBytes(jsonFields));
                request.downloadHandler = new DownloadHandlerBuffer();
                request.SetRequestHeader("Content-Type", "application/json");
                request.SetRequestHeader("Accept", "application/json");

                yield return request.SendWebRequest();

                Response apiReponse = JsonUtility.FromJson<Response>(request.downloadHandler?.text);
                
                if (handleResponse != null)
                    handleResponse(apiReponse);
            }
        }

        private static string handleRouteName(string routeName)
        {
            if (routeName.StartsWith("/"))
                return routeName;

            return $"/{routeName}";
        }
    }
}

Response.cs

using System;

namespace Project.Base
{
    [Serializable]
    public class Response
    {
        public Data data;
    }

    [Serializable]
    public class Data
    {
        public string error;
        public string message;
        public Player player;
    }
}