EvenAndOdd.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

public class EvenAndOdd : MonoBehaviour
{
    [System.Serializable]
    class Match
    {
        public string id;
        public int player1_move;
        public int player2_move;
    }

    UnityWebRequestAsyncOperation asyncOperation;
    bool dataReceived;

    delegate void PairAndOddState();
    PairAndOddState currentState;

    float nextPollTimer;

    void MakeCreateMatchRequest()
    {
        UnityWebRequest request = new UnityWebRequest("http://127.0.0.1:5000/create_match");
        request.SetRequestHeader("PairAndOdd", "odd");
        request.downloadHandler = new DownloadHandlerBuffer();
        asyncOperation = request.SendWebRequest();
        currentState = CheckCreateRequest;
    }

    void CheckCreateRequest()
    {
        if (asyncOperation.isDone)
        {
            Debug.Log(asyncOperation.webRequest.responseCode);
            currentState = MakePollRequest;
        }
    }

    void MakePollRequest()
    {
        UnityWebRequest request = new UnityWebRequest("http://127.0.0.1:5000/poll");
        request.downloadHandler = new DownloadHandlerBuffer();
        asyncOperation = request.SendWebRequest();
        currentState = CheckPollRequest;
    }

    void CheckPollRequest()
    {
        if (asyncOperation.isDone)
        {
            Debug.Log(asyncOperation.webRequest.responseCode);
            Match match = JsonUtility.FromJson<Match>(asyncOperation.webRequest.downloadHandler.text);
            Debug.Log(match.id);
            Debug.Log(match.player1_move);
            Debug.Log(match.player2_move);
            nextPollTimer = 3;
            currentState = WaitForNextPoll;
        }
    }

    void WaitForNextPoll()
    {
        nextPollTimer -= Time.deltaTime;
        if (nextPollTimer <= 0)
            currentState = MakePollRequest;
    }

    void Start()
    {
        currentState = MakeCreateMatchRequest;
    }

    void Update()
    {
        currentState();
    }
}