c#之使用 HttpWebRequest.GetResponse 时出现 KeepAliveException

我正在尝试使用 HttpWebRequest 将附件发布到 CouchDB。但是，当我尝试“response = (HttpWebResponse)httpWebRequest.GetResponse();”时我收到一个 WebException 消息“底层连接已关闭:服务器关闭了预期保持事件状态的连接。”

我发现一些文章指出将 keepalive 设置为 false 并将 httpversion 设置为 1.0 可以解决这种情况。我发现它不会产生完全相同的错误，而且我不想采用这种方法，因为由于它处理连接的方式，我不想使用 1.0 版本。

欢迎提出任何建议或想法。我会尝试所有方法，直到一个有效!

public ServerResponse PostAttachment(Server server, Database db, Attachment attachment) 
    { 
        Stream dataStream; 
        HttpWebResponse response = null; 
        StreamReader sr = null; 
        byte[] buffer; 
        string json; 
        string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x"); 
        string headerTemplate = "Content-Disposition: form-data; name=\"_attachments\"; filename=\"" + attachment.Filename + "\"\r\n Content-Type: application/octet-stream\r\n\r\n"; 
        byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(headerTemplate); 
        byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); 
 
 
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://" + server.Host + ":" +  
            server.Port.ToString() + "/" + db.Name + "/" + attachment.Document.Id); 
        httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary; 
        httpWebRequest.Method = "POST"; 
        httpWebRequest.KeepAlive = true; 
        httpWebRequest.ContentLength = attachment.Stream.Length + headerbytes.Length + boundarybytes.Length; 
 
        if (!string.IsNullOrEmpty(server.EncodedCredentials)) 
            httpWebRequest.Headers.Add("Authorization", server.EncodedCredentials); 
 
        if (!attachment.Stream.CanRead) 
            throw new System.NotSupportedException("The stream cannot be read."); 
 
        // Get the request stream 
        try 
        { 
            dataStream = httpWebRequest.GetRequestStream(); 
        } 
        catch (Exception e) 
        { 
            throw new WebException("Failed to get the request stream.", e); 
        } 
 
 
        buffer = new byte[server.BufferSize]; 
        int bytesRead; 
 
        dataStream.Write(headerbytes,0,headerbytes.Length);  
 
        attachment.Stream.Position = 0; 
        while ((bytesRead = attachment.Stream.Read(buffer, 0, buffer.Length)) > 0) 
        { 
            dataStream.Write(buffer, 0, bytesRead); 
        } 
 
        dataStream.Write(boundarybytes, 0, boundarybytes.Length); 
        dataStream.Close(); 
 
        // send the request and get the response 
        try 
        { 
            response = (HttpWebResponse)httpWebRequest.GetResponse(); 
        } 
        catch (Exception e) 
        { 
            throw new WebException("Invalid response received from server.", e); 
        } 
 
        // get the server's response json 
        try 
        { 
            dataStream = response.GetResponseStream(); 
            sr = new StreamReader(dataStream); 
            json = sr.ReadToEnd(); 
        } 
        catch (Exception e) 
        { 
            throw new WebException("Failed to access the response stream.", e); 
        } 
 
        // close up all our streams and response 
        sr.Close(); 
        dataStream.Close(); 
        response.Close(); 
 
        // Deserialize the server response 
        return ConvertTo.JsonToServerResponse(json); 
    } 

请您参考如下方法:

在对该主题进行了大量研究之后，我决定使用 PUT。虽然 Futon 使用 POST 方法，但它没有记录。对于以后阅读本文的任何人，请使用 PUT 方法，这将使您的生活更加轻松。