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POError using HttpWebRequest to upload files with PUT
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  1. POError using HttpWebRequest to upload files with PUT
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    copied!<p>We've got a .NET 2.0 WinForms app that needs to upload files to an IIS6 Server via WebDav. From time to time we get complaints from a remote office that they get one of the following error messages</p> <ul> <li>The underlying connection was closed: an unexpected error occurred on send.</li> <li>The underlying connection was closed: an unexpected error occurred on receive.</li> </ul> <p>This only seems to occur with large files (~20Mb plus). I've tested it with a 40Mb file from my home computer and tried putting 'Sleep's in the loop to simulate a slow connection so I suspect that it's down to network issues at their end... but </p> <ol> <li>The IT at the remote office are no help</li> <li>I'd like to rule out the posibility my code is at fault.</li> </ol> <p>So - can anybody spot any misakes or suggest any workarounds that might 'bulletproof' the code against this problem. Thanks for any help. Chopped down version of code follows:</p> <pre><code> public bool UploadFile(string localFile, string uploadUrl) { HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uploadUrl); try { req.Method = "PUT"; req.AllowWriteStreamBuffering = true; req.UseDefaultCredentials = Program.WebService.UseDefaultCredentials; req.Credentials = Program.WebService.Credentials; req.SendChunked = false; req.KeepAlive = true; Stream reqStream = req.GetRequestStream(); FileStream rdr = new FileStream(localFile, FileMode.Open, FileAccess.Read); byte[] inData = new byte[4096]; int bytesRead = rdr.Read(inData, 0, inData.Length); while (bytesRead &gt; 0) { reqStream.Write(inData, 0, bytesRead); bytesRead = rdr.Read(inData, 0, inData.Length); } reqStream.Close(); rdr.Close(); System.Net.HttpWebResponse response = (HttpWebResponse)req.GetResponse(); if (response.StatusCode != HttpStatusCode.OK &amp;&amp; response.StatusCode!=HttpStatusCode.Created) { MessageBox.Show("Couldn't upload file"); return false; } } catch (Exception ex) { MessageBox.Show(ex.ToString()); return false; } return true; } </code></pre>
 

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