/// <summary>
/// ����������
/// �������ײ�����Ĵ���
/// </summary>
public NetworkResponse PerformRequest(Request request)
{
long requestStart = SystemClock.ElapsedRealtime();
while (true)
{
HttpWebResponse httpResponse = null;
byte[] responseContents = null;
Dictionary<String,String> responseHeaders = null;
try
{
Dictionary<String, String> headers = new Dictionary<string, string>();
AddCacheHeaders(headers, request.CacheEntry);
//��������
httpResponse = mHttpStack.PerformRequest(request, headers);
var statusCode = httpResponse.StatusCode;
responseHeaders = ConvertHeaders(httpResponse.Headers);
if (statusCode == HttpStatusCode.MovedPermanently || statusCode == HttpStatusCode.Moved)
{
String newUrl = responseHeaders["Location"];
request.SetRedirectUrl(newUrl);
}
//��ȡ��������
Stream output = httpResponse.GetResponseStream();
if (output != null)
{
responseContents = EntityToBytes(output);
}
else
{
responseContents = new byte[0];
}
long requestLifetime = SystemClock.ElapsedRealtime() - requestStart;
LogSlowRequests(requestLifetime, request, responseContents, statusCode);
if (statusCode < HttpStatusCode.OK || (int)statusCode > 299)
{
throw new IOException();
}
return new NetworkResponse(statusCode, responseContents, responseHeaders, false,
SystemClock.ElapsedRealtime() - requestStart);
}
catch (WebException ex)
{
if (ex.Response != null)
{
var result = ex.Response as HttpWebResponse;
if (result.StatusCode == HttpStatusCode.NotModified)
{
Entry entry = request.CacheEntry;
if (entry == null)
{
return new NetworkResponse(HttpStatusCode.NotModified, null,
responseHeaders, true,
SystemClock.ElapsedRealtime() - requestStart);
}
//entry.ResponseHeaders = entry.ResponseHeaders.Intersect(responseHeaders).ToDictionary(x => x.Key, x => x.Value);
return new NetworkResponse(HttpStatusCode.NotModified, entry.Data,
entry.ResponseHeaders, true,
SystemClock.ElapsedRealtime() - requestStart);
}
}
throw new NetworkError(ex);
}
catch (TimeoutException)
{
AttempRetryOnException("connection", request, new TimeoutError());
}
catch (IOException e)
{
HttpStatusCode statusCode = 0;
NetworkResponse networkResponse = null;
if (httpResponse != null)
{
statusCode = httpResponse.StatusCode;
}
else
{
throw new NoConnectionError(e);
}
if (statusCode == HttpStatusCode.MovedPermanently)
{
VolleyLog.E("Request at {0} has been redirected to {1}", request.OriginUrl, request.Url);
}
else
{
VolleyLog.E("Unexpected response code {0} for {1}", statusCode, request.Url);
}
if (responseContents != null)
{
networkResponse = new NetworkResponse(statusCode, responseContents,
responseHeaders, false, SystemClock.ElapsedRealtime() - requestStart);
if (statusCode == HttpStatusCode.Unauthorized || statusCode == HttpStatusCode.Forbidden)
{
AttempRetryOnException("auth", request, new AuthFailureError());
}
else if (statusCode == HttpStatusCode.MovedPermanently || statusCode == HttpStatusCode.Moved)
{
AttempRetryOnException("redirect", request, new AuthFailureError(networkResponse));
}
else
{
throw new ServerError(networkResponse);
}
}
else
{
throw new NetworkError(networkResponse);
}
}
}
}
public HttpWebResponse PerformRequest(Request request, Dictionary<string, string> additionalHeaders)
{
if (UrlRewriter != null)
{
String rewritten = UrlRewriter.RewriteUrl(request.Url);
if (!String.IsNullOrEmpty(rewritten))
{
request.SetRedirectUrl(rewritten);
}
}
var httpRequest = CreateHttpRequest(request);
foreach (KeyValuePair<String, String> head in additionalHeaders)
{
try
{
httpRequest.Headers.Add(head.Key, head.Value);
}
catch (Exception)
{
continue;
}
}
foreach (KeyValuePair<String, String> head in request.GetHeaders())
{
try
{
httpRequest.Headers.Add(head.Key, head.Value);
}
catch (Exception)
{
continue;
}
}
return (HttpWebResponse)httpRequest.GetResponse();
}