1、WWW（基于協(xié)程，不適用于線程）

IEnumerator WWWGet()
{
    using (WWW www = new WWW("http://127.0.0.1:9997/gameInit?uid=7"))
    {
        yield return www;
        if (www.error != null)
        {
            Debug.Log(www.error);
        }
        else
        {
            Debug.Log(www.text.ToString());
        }
        www.Dispose();//釋放
    }
}

IEnumerator WWWPost()
{
    Dictionary<string, string> hash = new Dictionary<string, string>();
    hash.Add("Content-Type", "application/json");
    string data = "{\"Name\":\"zhangsan\",\"Password\":\"123456\"}";
    byte[] bs = System.Text.UTF8Encoding.UTF8.GetBytes(data);
    WWW www = new WWW("http://127.0.0.1:9997/login", bs, hash);
    
    yield return www;
    if (www.error != null)
    {
            Debug.Log(www.error);
    }
    else
    {
        Debug.Log(www.text.ToString());
    }
    www.Dispose();//釋放
}

2、UnityWebRequest（基于協(xié)程，不適用于線程）

IEnumerator GetRequest()
{
    string url = "https://www.baidu.com/";
    using (UnityWebRequest webRequest = UnityWebRequest.Get(url))
    {

        //設(shè)置header
        webRequest.SetRequestHeader("Content-Type", "application/json");
        webRequest.SetRequestHeader("authKey", "leohui");

        yield return webRequest.SendWebRequest();

        if (webRequest.isHttpError || webRequest.isNetworkError)
        {
            Debug.LogError(webRequest.error);
        }
        else
        {
            Debug.Log(webRequest.downloadHandler.text);
        }
    }
}

IEnumerator PostRequest()
{
    string url = "https://www.baidu.com/";
    using (UnityWebRequest webRequest = new UnityWebRequest(url, "POST"))
    {
        string data = "{\"Name\":\"zhangsan\",\"Password\":\"123456\"}";
        byte[] bodyRaw = Encoding.UTF8.GetBytes(data);
        webRequest.uploadHandler = (UploadHandler) new UploadHandlerRaw(bodyRaw);
        webRequest.downloadHandler = (DownloadHandler) new DownloadHandlerBuffer();

        //設(shè)置header
        webRequest.SetRequestHeader("Content-Type", "application/json");
        webRequest.SetRequestHeader("authKey", "leohui");

        yield return webRequest.SendWebRequest();

        if (webRequest.isHttpError || webRequest.isNetworkError)
        {
            Debug.LogError(webRequest.error);
        }
        else
        {
            Debug.Log(webRequest.downloadHandler.text);
        }
    }
}

3、HttpWebRequest（C#原生的HttpWebRequest，同步接口，阻塞等待結(jié)果返回，適用于線程）

在Unity中，使用C#原生的HttpWebRequest，若是數(shù)據(jù)較大，會卡頓，主要因為Unity單線程，HttpWebRequest不能異步執(zhí)行，但適用于多線程。

HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.ReadWriteTimeout = ReadWriteTimeOut;
request.Timeout = TimeOutWait;
//設(shè)置Range值，斷點續(xù)傳
request.AddRange((int)startPos);
HttpWebResponse respone = (HttpWebResponse)request.GetResponse();
Stream ns = respone.GetResponseStream();
ns.ReadTimeout = TimeOutWait;
byte[] bytes = new byte[oneReadLen];
int readSize = ns.Read(bytes, 0, oneReadLen); // 讀取第一份數(shù)據(jù)
while (readSize > 0)
{
     fs.Write(bytes, 0, readSize); // 將下載到的數(shù)據(jù)寫入臨時文件
     // 往下繼續(xù)讀取
     readSize = ns.Read(bytes, 0, oneReadLen);
}