/// <summary>
/// Checks for known redirects and alters the request url if required, passes the request on to the next handler in the pipeline, then handles any redirect responses until a non-redirect response is received.
/// </summary>
/// <param name="request">The <see cref="HttpRequestMessage"/> to send.</param>
/// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to cancel the request.</param>
/// <returns></returns>
protected override async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
request.RequestUri = _RedirectCache.GetFinalUri(request.RequestUri);
cancellationToken.ThrowIfCancellationRequested();
var result = await base.SendAsync(request, cancellationToken).ConfigureAwait(false);
int redirects = 0;
while (redirects < MaxRedirects)
{
cancellationToken.ThrowIfCancellationRequested();
if (result.StatusCode.IsRedirect())
{
if (String.Compare(request.Method.Method, "GET", StringComparison.OrdinalIgnoreCase) == 0 && result.Headers.Location != null)
{
if (result.StatusCode.IsPermanentRedirect())
{
_RedirectCache.AddOrUpdateRedirect(request.RequestUri, result.Headers.Location);
}
request.RequestUri = result.Headers.Location;
result = await base.SendAsync(request, cancellationToken).ConfigureAwait(false);
}
redirects++;
}
else
{
break;
}
}
return(result);
}
/// <summary>
/// Checks for known redirects and alters the request url if required, passes the request on to the next handler in the pipeline, then handles any redirect responses until a non-redirect response is received.
/// </summary>
/// <param name="request">The <see cref="HttpRequestMessage"/> to send.</param>
/// <returns></returns>
public IAsyncOperationWithProgress <HttpResponseMessage, HttpProgress> SendRequestAsync(HttpRequestMessage request)
{
return(AsyncInfo.Run <HttpResponseMessage, HttpProgress>(async(cancellationToken, progress) =>
{
request.RequestUri = _RedirectCache.GetFinalUri(request.RequestUri);
cancellationToken.ThrowIfCancellationRequested();
var result = await _InnerFilter.SendRequestAsync(request).AsTask().ConfigureAwait(false);
int redirects = 0;
while (redirects < MaxRedirects)
{
if (result.StatusCode.IsRedirect())
{
if (String.Compare(request.Method.Method, "GET", StringComparison.OrdinalIgnoreCase) == 0 && result.Headers.Location != null)
{
if (result.StatusCode.IsPermanentRedirect())
{
_RedirectCache.AddOrUpdateRedirect(request.RequestUri, result.Headers.Location);
}
var request2 = new HttpRequestMessage(request.Method, result.Headers.Location);
WebHttpHeaderExtensions.CopyHeadersTo(request.Headers, request2.Headers);
result = await _InnerFilter.SendRequestAsync(request2).AsTask().ConfigureAwait(false);
}
redirects++;
}
else
{
break;
}
cancellationToken.ThrowIfCancellationRequested();
}
return result;
}));
}