/// <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;
}));
}
/// <summary>
/// Applies the configured dynamic headers and passes the request on.
/// </summary>
/// <remarks>
/// <para>Does not modify headers that already have a value.</para>
/// <para>Does not create/apply headers where the function returning the value returns null.</para>
/// </remarks>
/// <param name="request">The <see cref="Windows.Web.Http.HttpRequestMessage"/> to process and pass on.</param>
/// <returns>An asynchronous operation whose result is a <see cref="HttpResponseMessage"/> from the server.</returns>
public IAsyncOperationWithProgress <HttpResponseMessage, HttpProgress> SendRequestAsync(HttpRequestMessage request)
{
return(AsyncInfo.Run <HttpResponseMessage, HttpProgress>(async(cancellationToken, progress) =>
{
if (_ApplyHeadersCondition?.ShouldProcess(request) ?? true)
{
foreach (var kvp in _DynamicHeaders)
{
var value = kvp.Value();
if (value != null)
{
request.Headers.Add(kvp.Key, value);
}
cancellationToken.ThrowIfCancellationRequested();
}
}
return await _InnerFilter.SendRequestAsync(request).AsTask().ConfigureAwait(false);
}));
}
