Unity新的网络请求方式UnityWebRequest（5.2版本以后）

Get方式：

 private IEnumerator SendUrl(string url)
    {
        using (UnityWebRequest www = UnityWebRequest.Get(url))
        {
            yield return www.Send();
            if (www.error != null)
            {
                Debug.Log(www.error);
            }
            else
            {
                if (www.responseCode == 200)//200表示接受成功
                {
                    Debug.Log(www.downloadHandler.text);
                }
            }
        }
    }

Post方式：

 public IEnumerator PostUrl(string url, string postData)
    {
        using (UnityWebRequest www = new UnityWebRequest(url,"POST"))
        {
            byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(postData);
            www.uploadHandler = (UploadHandler)new UploadHandlerRaw(postBytes);
            www.downloadHandler = (DownloadHandler)new DownloadHandlerBuffer();
            www.SetRequestHeader("Content-Type", "application/json");
            yield return www.Send();
            if (www.isError)
            {
                Debug.Log(www.error);
            }
            else
            {
                // Show results as text  
                if (www.responseCode == 200)
                {
                    Debug.Log(www.downloadHandler.text);
                }
            }
        }
    }

private IEnumerator PostUrl(string url, WWWForm form, Action getResult)
    {
       
        using (UnityWebRequest www = UnityWebRequest.Post(url, form))
        {
            yield return www.Send();
            
            if (www.isError)
            {
               
                yield return  www.error;
            }
            else
            {
                if (www.responseCode == 200)
                {
                   
                    getResult(www.downloadHandler.text);
                }
            }
        }
       
    }