写一套Unity使用WebSocket从服务器获取信息（基于Besthttp插件）

在Unity中使用WebSocket从服务器获取信息，通常会借助第三方插件如BestHTTP。以下是简单的步骤：

1. **安装BestHTTP插件**:
首先，你需要通过NuGet包管理器将BestHTTP添加到项目中。在Unity编辑器中打开`Window > Package Manager`，然后搜索并安装"Best HTTP Client"。

2. **设置连接**:
创建一个脚本，在C#中导入`BestHTTP`命名空间，并创建一个`BestHttpClient`实例。例如：

using BestHTTP;
using UnityEngine;

public class WebSocketExample : MonoBehaviour
{
    private readonly string _url = "ws://your-server-url.com";
    private BestHTTPClient client;

    void Start()
    {
        client = new BestHTTPClient();
        ConnectToServer();
    }

    void ConnectToServer()
    {
        var request = new HttpRequestMessage(HttpMethod.Connect, _url);
        client.AddRequest(request)
            .OnResponseEnd += OnResponseReceived;
        client.SendAsync();
    }

    private void OnResponseReceived(HttpRequestMessage response)
    {
        if (response.IsSuccessStatusCode)
        {
            Debug.Log("Connected to server.");
            // 连接成功后，开始接收消息
            SubscribeForMessages();
        }
        else
        {
            Debug.LogError($"Failed to connect: {response.StatusCode}");
        }
    }

    private void SubscribeForMessages()
    {
        var subscribeRequest = new WebSocketSubscribeMessageRequest(_url + "/messages");
        client.AddWebSocketRequest(subscribeRequest)
            .OnMessage += OnMessageReceived;
    }

    private void OnMessageReceived(WebSocketMessage message)
    {
        Debug.Log($"Received message: {message.Data}");
    }
}