SharePoint 2019 Search REST API Is Returning 401 Unauthorized - When Called from C# Using Basic Authorization Request Header

Question

I have my own C# Web API service (targeting .NET 5.0) that is sitting on the same server where an on-premise SharePoint 2019 is located. 我的代码调用内置的 SharePoint REST API 进行搜索并返回结果（外界只会访问我的服务）。

我从该服务器上的 IE 调用 SharePoint REST API 没有问题。

Within my Web API service (https) I call the SharePoint Rest service (http) using the same url that worked in IE

using (var client = new HttpClient())
{
     client.BaseAddress = new Uri(sharePointSearchServiceBaseUrl); 
     client.DefaultRequestHeaders.Clear();
     client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

     var plainTextBytes = System.Text.Encoding.UTF8.GetBytes("account:password");
     string val = System.Convert.ToBase64String(plainTextBytes);
     client.DefaultRequestHeaders.Add("Authorization", "Basic " + val);

     HttpResponseMessage response = await client.GetAsync("search/query?querytext='(oil*)'&rowlimit=100");

     if (response.IsSuccessStatusCode) 
     {
        var objResponse = response.Content.ReadAsStringAsync().Result;                        
        return Content(objResponse);
     }
    

不幸的是，client.GetAsync 的结果总是如下：

INFO 2021-01-07 01:24:18 状态码： 401，ReasonPhrase：“未授权” ，版本：1.1，内容：System.Net.Http.HttpConnectionResponseContent，标头：{服务器：Microsoft-IIS/10.0 SPRequestGuid：47049f9f-8244 -1032-40ac-07df48a24632 request-id: 47049f9f-8244-1032-40ac-07df48a24632 X-Frame-Options: SAMEORIGIN SPRequestDuration: 6 SPIisLatency: 2 WWW-Authenticate: NTLM X-Powered-By: ASP.NET MicrosoftSharePointTeamServices: 16.0.0.10368 X -Content-Type-Options：nosniff X-MS-InvokeApp：1； RequireReadOnly 日期：2021 年 1 月 7 日星期四 18:24:18 GMT 内容长度：0 }

我已经尝试通过我拥有的所有 SharePoint 帐户，并且所有这些帐户都给了我相同的 401。

任何解决此问题的见解将不胜感激。

Answer 1

我能够找到解决方案。 最重要的一行是 NetworkCredential 行。 我尝试了许多其他方法，但这是唯一对我有用的方法。

using (var handler = new HttpClientHandler())
   {
            handler.Credentials =  new NetworkCredential(account, password, domain); 
            using (var client = new HttpClient(handler))
            {
                var requri = new Uri("http://localhost:30001/_api/search/query?querytext='(oil*)'&rowlimit=100");
                HttpResponseMessage response = await client.GetAsync(requri);

                if (response.IsSuccessStatusCode)
                {
                    var objResponse = response.Content.ReadAsStringAsync().Result;
                    _logger.LogInformation("Results are: " + objResponse);
                    return Content(objResponse);
                }
                else
                {
                    _logger.LogInformation("Sharepoint service call - was NOT successful");
                    _logger.LogInformation(response.ToString());
                    return null;
                }
            }
        }