Question Httprequest works in Unity Editor but does not work on Hololens

Hi,

I use System.net HttpWebRequest and HttpWebResponse to create GET and POST request. When I run my app in Unity Editor, everything works well. The code can read the data from the server.

However, when I deploy on Hololens, the code fails to read the data from the server and throw exception message: "connectfailure (value does not fall within the expected range.)" when I debugged the code running on Hololens.

My system:

Unity 2019.1.10f1
Visual studio community 2017 version 15.9.34
InternetClient, InternetClientServer, and PrivateNetworkClientServer are all enabled

Build targeted SDK version 10.0.18362.0

and here is the code

Code (CSharp):

1.  
2.  
3.     using System.Collections;
4.     using System.Collections.Generic;
5.     using UnityEngine;
6.     using System.Net.Http;
7.     using System.Net;
8.     using System.IO;
9.     using System;
10.    
11.     public class makeRequest
12.     {
13.         public enum TypeOfRequest { GET, POST }
14.    
15.         public static string HTTPRequest(string url, string json, TypeOfRequest req)
16.         {
17.             string strResponseValue = string.Empty;
18.             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
19.    
20.             request.ContentType = "application/json";
21.             request.Method = req.ToString();
22.    
23.    
24.             if (json != null && request.Method == "POST")
25.             {
26.    
27.                 using (StreamWriter sw = new StreamWriter(request.GetRequestStream()))
28.                 {
29.                     sw.Write(json);
30.                     sw.Close();
31.                 }
32.             }
33.    
34.    
35.    
36.             HttpWebResponse response = null;
37.             try
38.             {
39.                 response = (HttpWebResponse)request.GetResponse();
40.    
41.                 using (Stream responseStream = response.GetResponseStream())
42.                 {
43.                     if (responseStream != null)
44.                     {
45.                         using (StreamReader reader = new StreamReader(responseStream))
46.                         {
47.                             strResponseValue = reader.ReadToEnd();
48.                         }
49.                     }
50.                 }
51.             }
52.    
53.             catch (Exception ex)
54.             {
55.    
56.                 strResponseValue = "{\"errorMessages\":[\"" + ex.Message.ToString() + "\"],\"errors\":{}}";
57.             }
58.             finally
59.             {
60.                 if (response != null)
61.                 {
62.                     ((IDisposable)response).Dispose();
63.                 }
64.             }
65.    
66.    
67.             return strResponseValue;
68.         }
69.     }
70.  
71.  
72.  

Any idea how to fix this?

Thanks