一，出现问题

在使用下面这个协程时，传值是“0” ，正常的测试结果request.isNetworkError为True 结束协程：

报错代码：

IEnumerator GetUrlData(string url)
{
      Debug.Log("GetADImageList url: " + url);
      
      UnityWebRequest request = UnityWebRequest.Get(url);
      yield return request.SendWebRequest();
      
      if (request.isHttpError || request.isNetworkError)
      {
          yield break;
      }
      if (string.IsNullOrEmpty(request.downloadHandler.text))
      {
          yield break;
      }
      JsonData data = JsonMapper.ToObject(request.downloadHandler.text);
        
      // todo... 
 }

二，报错信息：

在真机Oppo R9 上出现的问题，在其他机型的手机没有出现这个问题：

>GetADImageList url: 0

>GetADImageList IsNullOrEmpty Accept

>输出condition:JsonException: Invalid character 'A' in input string,输出stackTrace:LitJson.Lexer.NextToken () (at <00000000000000000000000000000000>:0)
    LitJson.JsonReader.ReadToken () (at <00000000000000000000000000000000>:0)
    LitJson.JsonReader.Read () (at <00000000000000000000000000000000>:0)
    LitJson.JsonMapper.ReadValue (LitJson.WrapperFactory factory, LitJson.JsonReader reader) (at <00000000000000000000000000000000>:0)
    LitJson.JsonMapper.ToObject (System.String json) (at <00000000000000000000000000000000>:0)
    ADSDK+<GetADImageList>d__104.MoveNext () (at <00000000000000000000000000000000>:0)
    UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)

三，修正代码：

后来没有分析出原因，也没有找到解决方案，只能在后面使用获得结果的时候加个异常捕获：

IEnumerator GetUrlData(string url)
{
      Debug.Log("GetADImageList url: " + url);
      UnityWebRequest request = UnityWebRequest.Get(url);
      yield return request.SendWebRequest();
      if (request.isHttpError || request.isNetworkError)
      {
          yield break;
      }
      if (string.IsNullOrEmpty(request.downloadHandler.text))
      {
          yield break;
      }
      JsonData data;
      try
      {
          data = JsonMapper.ToObject(request.downloadHandler.text);
      }
      catch (Exception e)
      {
          Debug.Log("GetADImageList request.downloadHandler.text: " + request.downloadHandler.text);
          throw e;
      }
      // todo... 
 }