private async Task<CoreResponseData> ReadResponseAsync(Connection connection)
{
_readState = ReadState.Start;
var requestDone = false;
var bytesScanned = 0;
var readBuffer = new ArraySegment<byte>();
var buffer_offset = connection.Buffer.Offset;
var buffer_length = connection.Buffer.Length;
while (!requestDone)
{
if (this.Aborted)
{
throw new OperationCanceledException("The request was canceled.");
}
readBuffer = await connection.ReadPooledBufferAsync(buffer_offset, buffer_length);
var bytesRead = readBuffer.Count;
if (bytesRead == 0)
{
//connection is closed by the remote host.
break;
}
bytesScanned = 0;
var parseStatus = this.ParseResponseData(readBuffer, ref bytesScanned, ref requestDone);
if (parseStatus == DataParseStatus.Invalid || parseStatus == DataParseStatus.DataTooBig)
{
if (parseStatus == DataParseStatus.Invalid)
{
throw new HttpResponseException("Cannot correct to parse the server response.",WebExceptionStatus.ServerProtocolViolation);
}
else
{
throw new HttpResponseException("The server response buffer limit exceeded.", WebExceptionStatus.MessageLengthLimitExceeded);
}
}
else if (parseStatus == DataParseStatus.NeedMoreData)
{
var unparsedDataSize = bytesRead - bytesScanned;
if (unparsedDataSize > 0)
{
if (unparsedDataSize >= BufferPool.DefaultBufferLength)
{
throw new IOException("unparsed size exceeded the buffer length.");
}
Buffer.BlockCopy(connection.Buffer.Array, bytesScanned, connection.Buffer.Array, connection.Buffer.Offset, unparsedDataSize);
buffer_offset = unparsedDataSize;
buffer_length -= unparsedDataSize;
}
}
else
{
buffer_length = connection.Buffer.Length;
buffer_offset = connection.Buffer.Offset;
}
}
//if (!requestDone)
//{
// throw new HttpRequestException("The request not finished.");
//}
if (_cookieContainer != null)
{
_cookieContainer.SetCookies(_uri, _responseHeaders.SetCookie);
}
if (this.CheckRedirect((HttpStatusCode)_statusLineValues.StatusCode))
{
if (_redirectedToDifferentHost)
{
var previous_connection = connection;
connection = this.FindServicePoint(true).SubmitRequest(this);
previous_connection.Close(true);
}
return await this.SendRequestAsync(connection);
}
var connectStream = this.CreateResponseStream(connection, readBuffer, bytesScanned);
return new CoreResponseData(_statusLineValues, _responseHeaders, connectStream);
}