Internal Server Error when Uploading Contect in c#

Question

Well there is another post about this http://discussions.apple.com/thread.jspa?messageID=4471561&#4471561 but it didn't have a solution and the person having the issue never mentioned getting it working.
Here is the function I'm using to post http data to itunesu.. all the post data works and returns properly except when uploading a file.
Any help would be apreciated.. I think my headers and contect headers are correct.
Brian
--Code--
private string HttpPost( string uri, string fileName )
HttpWebRequest webRequest = WebRequest.Create( uri ) as HttpWebRequest;
webRequest.Method = "POST";
webRequest.KeepAlive = true;
string boundary = "0xKhTmLbOuNdArY";
byte[] fileBuffer = null;
byte[] headerBuffer = null;
byte[] boundaryBeginningBuffer = null;
byte[] boundaryEndingBuffer = null;
long contentLength = 0;
if( fileName != null && fileName != string.Empty )
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
// Open up a file stream and read the file into the file buffer
using( FileStream fileStream = new FileStream( fileName, FileMode.Open, FileAccess.Read ) )
//read the file into the buffer
fileBuffer = new byte[fileStream.Length];
fileStream.Read( fileBuffer, 0, fileBuffer.Length );
contentLength += fileBuffer.Length;
//convert the header to a byte array
headerBuffer = System.Text.Encoding.UTF8.GetBytes( UrlEncodeForITunesU( string.Format( "Content-Disposition: form-data; name=\"file\"; filename=\"{0}\"\r\n Content-Type: application/octet-stream\r\n", fileName ) ) );
boundaryBeginningBuffer = System.Text.Encoding.UTF8.GetBytes( "\r\n--" + boundary + "\r\n" );
boundaryEndingBuffer = System.Text.Encoding.UTF8.GetBytes( "\r\n--" + boundary + "--\r\n" );
contentLength += headerBuffer.Length;
contentLength += boundaryBeginningBuffer.Length;
contentLength += boundaryEndingBuffer.Length;
else
webRequest.ContentType = "application/x-www-form-urlencoded";
Stream outputStream = null;
try
{ // send the Post
webRequest.ContentLength = contentLength;
outputStream = webRequest.GetRequestStream();
if ( contentLength > 0 )
//write out the beginning boundary
outputStream.Write( boundaryBeginningBuffer, 0, boundaryBeginningBuffer.Length );
//write out the content header
outputStream.Write( headerBuffer, 0, headerBuffer.Length );
//write out the content
outputStream.Write( fileBuffer, 0, fileBuffer.Length );
//write out the ending boundary
outputStream.Write( boundaryEndingBuffer, 0, boundaryEndingBuffer.Length );
catch ( WebException ex )
MessageBox.Show( ex.Message, "HttpPost: Request error", MessageBoxButtons.OK, MessageBoxIcon.Error );
finally
if ( outputStream != null )
outputStream.Close();
try
{ // get the response
WebResponse webResponse = webRequest.GetResponse();
if ( webResponse == null )
return null;
StreamReader sr = new StreamReader( webResponse.GetResponseStream() );
return sr.ReadToEnd().Trim();
catch ( WebException ex )
MessageBox.Show( ex.Message, "HttpPost: Response error", MessageBoxButtons.OK, MessageBoxIcon.Error );
return null;
}

Answer 1

Well I rewrote the code one more time and it worked amazingly enough. Below is the completed post function if anybody else needs a little help.
--Code--
private string HttpPost( string uri, string fileName )
HttpWebRequest webRequest = HttpWebRequest.Create( uri ) as HttpWebRequest;
string boundary;
boundary = "RESTMIME" + DateTime.Now.ToString( "yyyyMMddhhmmss" );
// fileData
UTF8Encoding encoding = new UTF8Encoding();
byte[] fileBytes = new byte[0];
byte[] postFooter = null;
FileStream fileStream = null;
long contentLength = 0;
byte[] postContents = null;
byte[] dataBuffer = null;
if ( fileName != null && fileName != string.Empty )
webRequest.ContentType = "multipart/form-data; boundary=\"" + boundary + "\"";
// Build up the post message header
StringBuilder sb = new StringBuilder();
sb.Append( "--" + boundary + "\r\n" );
sb.Append( "Content-Disposition: form-data; name=\"file\"; filename=\"" + Path.GetFileName( fileName ) + "\"\r\n" );
sb.Append( "Content-Type: application/octet-stream\r\n" );
sb.Append( "\r\n" );
// open up the file for reading
fileStream = new FileStream( fileName, FileMode.Open, FileAccess.Read );
contentLength += fileStream.Length;
int uploadLength = (int) fileStream.Length;
int startIndex = 0;
fileBytes = new byte[uploadLength];
fileStream.Seek( startIndex, SeekOrigin.Begin );
fileStream.Read( fileBytes, 0, uploadLength );
// We need to add in a linefeed/carriage return after the file
// data for the ending boundary.
postFooter = encoding.GetBytes( "\r\n--" + boundary + "--\r\n" );
postContents = encoding.GetBytes( sb.ToString() );
dataBuffer = new byte[postContents.Length + fileBytes.Length + postFooter.Length];
Buffer.BlockCopy( postContents, 0, dataBuffer, 0, postContents.Length );
Buffer.BlockCopy( fileBytes, 0, dataBuffer, postContents.Length, fileBytes.Length );
Buffer.BlockCopy( postFooter, 0, dataBuffer, postContents.Length + fileBytes.Length, postFooter.Length );
contentLength = dataBuffer.Length;
else
webRequest.ContentType = "application/x-www-form-urlencoded";
contentLength = 0;
Stream requestStream = null;
try
webRequest.ContentLength = contentLength;
webRequest.UserAgent = "Mozilla/4.0 FlickrNet API (compatible; MSIE 6.0; Windows NT 5.1)";
webRequest.Method = "POST";
webRequest.Referer = "http://www.example.com";
webRequest.KeepAlive = false;
webRequest.Timeout = 100000 * 100;
webRequest.ContentLength = contentLength;
requestStream = webRequest.GetRequestStream();
if ( contentLength > 0 )
int uploadBit = Math.Max( dataBuffer.Length / 100, 50 * 1024 );
int uploadSoFar = 0;
for ( int i = 0; i < dataBuffer.Length; i = i + uploadBit )
int toUpload = Math.Min( uploadBit, dataBuffer.Length - i );
uploadSoFar += toUpload;
requestStream.Write( dataBuffer, i, toUpload );
catch ( WebException ex )
MessageBox.Show( ex.Message, "HttpPost: Request error", MessageBoxButtons.OK, MessageBoxIcon.Error );
finally
if ( requestStream != null )
requestStream.Close();
try
{ // get the response
WebResponse webResponse = webRequest.GetResponse();
if ( webResponse == null )
return null;
StreamReader sr = new StreamReader( webResponse.GetResponseStream() );
return sr.ReadToEnd().Trim();
catch ( WebException ex )
MessageBox.Show( ex.Message, "HttpPost: Response error", MessageBoxButtons.OK, MessageBoxIcon.Error );
return null;
Message was edited by: dishawbr