GetReponse（）上的「底層連接已關閉：發送時發生意外錯誤」但不通過瀏覽器

Question

我試圖利用使用GET方法的REST服務。我正在使用.Net Framework 4.5.2。我在下面寫的只是一個測試，看看我是否可以實際提出請求。如果我把URL直接放到瀏覽器中，我會以json格式的字符串數據得到很好的迴應。但是當我嘗試運行代碼時，我最終得到了以下錯誤：

「底層連接已關閉：發送時出現意外錯誤。」 InnerException = {「無法從傳輸連接讀取數據：現有連接被遠程主機強制關閉。」}

我試過設置keepalive爲true和false，我試過使用WebClient以及DownloadString太....都導致相同的錯誤。有沒有人知道我錯過了什麼？或者這是服務器端的某種問題？

Dim script As String = "236" 
Dim deploy As String = "1" 
Dim compid As String = "915960_SB2" 
Dim h As String = "value1" 
Dim id As String = "1241389" 
Dim status As String = "in freezer" 
Dim request As HttpWebRequest 
Dim response As HttpWebResponse 

Try 

'I have removed the real website name from this code. 
      Dim theurl As String = "https://website/app/site/hosting/scriptlet.nl?script={0}&deploy={1}&compid={2}&h={3}&Id={4}&Status={5}" 
      Dim url As String = String.Format(theurl, script, deploy, compid, h, id, status) 

      request = HttpWebRequest.Create(url) 
      request.Method = "GET" 
      request.ContentType = "application/json" 

'This is where the error occurs 
      response = request.GetResponse() 

Catch ex As Exception 
      Dim test as string="" 
Finally 

End Try 

Answer 1

我解決了它。我偶然發現了其他人遇到同樣問題的下列網站。

http://www.avivroth.com/2013/05/02/rest-calls-in-net-c-over-ssl-https/

的解決方案是設置的安全協議。我剛剛從ssl到tls11，然後到tls12，發現最後一個工作。

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12