internal static HttpFormResponse ReadResponse(WebRequest request)
{
const int MaxTry = 3;
int tryCount = 0;
var httpFormResponse = new HttpFormResponse();
// Sometimes the external site can throw exception so we might
// have to retry few more times
while (string.IsNullOrEmpty(httpFormResponse.Response) && (tryCount < MaxTry))
{
try
{
using (WebResponse response = request.GetResponse())
{
PopulateHeadersAndCookies(response, httpFormResponse);
using (var sr = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8))
{
httpFormResponse.Response = sr.ReadToEnd();
}
}
}
catch (WebException)
{
tryCount += 1;
Thread.Sleep(200);
}
}
return(httpFormResponse);
}
internal static void PopulateHeadersAndCookies(WebResponse webResponse, HttpFormResponse response)
{
response.Headers.Add(webResponse.Headers);
var httpWebResponse = webResponse as HttpWebResponse;
if (httpWebResponse != null)
{
foreach (Cookie cookie in httpWebResponse.Cookies)
{
response.Cookies.Add(cookie.Name, cookie.Value);
}
}
}
internal static void ResponseCallback(IAsyncResult result)
{
var states = (StateContainer)result.AsyncState;
try
{
var httpFormResponse = new HttpFormResponse();
WebResponse response = states.Request.EndGetResponse(result);
PopulateHeadersAndCookies(response, httpFormResponse);
using (Stream stream = response.GetResponseStream())
{
const int BufferLength = 8096;
var buffer = new byte[BufferLength];
using (var ms = new MemoryStream())
{
int bytesRead;
while ((bytesRead = stream.Read(buffer, 0, BufferLength)) > 0)
{
ms.Write(buffer, 0, bytesRead);
}
ms.Flush();
httpFormResponse.Response = Encoding.UTF8.GetString(ms.ToArray());
}
if (states.OnComplete != null)
{
states.OnComplete(httpFormResponse);
}
}
}
catch (Exception e)
{
if (states.OnError != null)
{
states.OnError(e);
}
}
}
