Question

我们已经在生产中上传了文件RestApi。内部UploadFile调用另一个API（FileHandlerServlet）将照片保存在物理磁盘上。昨天，我们的UploadFile REST API收到了大量异常。异常说明

System.Net.WebException：基础连接已关闭：接收时发生意外错误。 --- System.IO.IOException：无法从传输连接读取数据：远程主机强行关闭了现有连接。 ---> System.Net.Sockets.SocketException：现有的连接被远程主机强行关闭在System.Net.Sockets.NetworkStream.Read（Byte []缓冲区，Int32偏移量，Int32大小） ---内部异常堆栈跟踪的结尾--- 在System.Net.Sockets.NetworkStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）在System.Net.PooledStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）在System.Net.Connection.SyncRead（HttpWebRequest请求，布尔userRetrievedStream，布尔probeRead） ---内部异常堆栈跟踪的结尾--- 在System.Net.HttpWebRequest.GetRequestStream（TransportContext＆context）在System.Net.HttpWebRequest.GetRequestStream（）在Photos.WebApis.Utilities.Helper.UploadFilesToRemoteUrl（String url，Byte [] img）在D：\ Source \ Person \ Photos \ Photos.WebApis \ Utilities \ Helper.cs：line 60中在Photos.WebApis.Controllers.AddPersonalPhotoController.POST（HttpRequestMessage请求，DtoPersonalPhoto照片）位于D：\ Source \ Person \ Photos \ Photos.WebApis \ Controllers \ AddPersonalPhotoController.cs：line 102

乍看之下，当UploadFile API与FileHandlerServlet通信时，似乎存在一些问题。在这个级别上，我们可以责备FileHandlerServlet或Network。但这种情况并非如此。因为当网络团队重新启动UploadFile API的IIS时，一切正常。 Api是在MVC5，.Net框架4.6.1中开发的。我的问题“ IIS，应用程序池等是否存在任何问题？”

此问题仅发生过一次。通常，UploadFile API每天处理10K +条记录。

这是示例代码

public string UploadFilesToRemoteUrl(string url, byte[] img)
    {
        string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.ContentType = "multipart/form-data; boundary=" + boundary;
        request.Method = "POST";
        request.UseDefaultCredentials = false;
        request.PreAuthenticate = true;

        var FileServerUserName = WebConfigurationManager.AppSettings["FileUserName"].ToString();
        var FileServerPwd = WebConfigurationManager.AppSettings["FilePwd"].ToString();
        request.Credentials = new NetworkCredential(FileServerUserName, FileServerPwd);

        var boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
        var endBoundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--");
        string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
        string headerTemplate =
            "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" +
            "Content-Type: application/octet-stream\r\n\r\n";

        Stream memStream = new MemoryStream();
        memStream.Write(boundarybytes, 0, boundarybytes.Length);
        var header = string.Format(headerTemplate, "uplTheFile", "MyyyPic");
        var headerbytes = Encoding.UTF8.GetBytes(header);
        memStream.Write(headerbytes, 0, headerbytes.Length);
        memStream.Write(img, 0, img.Length);
        memStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
        request.ContentLength = memStream.Length;

        using (Stream requestStream = request.GetRequestStream())
        {
            memStream.Position = 0;
            byte[] tempBuffer = new byte[memStream.Length];
            memStream.Read(tempBuffer, 0, tempBuffer.Length);
            memStream.Close();
            requestStream.Write(tempBuffer, 0, tempBuffer.Length);
        }
        using (var response = request.GetResponse())
        {
            Stream stream2 = response.GetResponseStream();
            StreamReader reader2 = new StreamReader(stream2);
            return reader2.ReadToEnd();
        }
    }

System.Net.WebException：基础连接已关闭->。 System.IO.IOException：无法从传输连接读取数据

0 个答案: