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. 我的代碼調用內置的 SharePoint REST API 進行搜索並返回結果（外界只會訪問我的服務）。

我從該服務器上的 IE 調用 SharePoint REST API 沒有問題。

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 的結果總是如下：

INFO 2021-01-07 01:24:18 狀態碼： 401，ReasonPhrase：“未授權” ，版本：1.1，內容：System.Net.Http.HttpConnectionResponseContent，標頭：{服務器：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 內容長度：0 }

我已經嘗試通過我擁有的所有 SharePoint 帳戶，並且所有這些帳戶都給了我相同的 401。

任何解決此問題的見解將不勝感激。

Answer 1

我能夠找到解決方案。 最重要的一行是 NetworkCredential 行。 我嘗試了許多其他方法，但這是唯一對我有用的方法。

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;
                }
            }
        }