public override Response ParseNetworkResponse(NetworkResponse response)
{
Java.Lang.String parsed;
try
{
parsed = new Java.Lang.String(response.Data, HttpHeaderParser.ParseCharset(response.Headers));
}
catch (Java.IO.UnsupportedEncodingException)
{
parsed = new Java.Lang.String(response.Data);
}
return Response.Success(parsed.ToString(), HttpHeaderParser.ParseCacheHeaders(response));
}
public ServerError(NetworkResponse networkResponse)
: base(networkResponse)
{
}
public override Response ParseNetworkResponse(NetworkResponse response)
{
return null;
}
public static Entry ParseCacheHeaders(NetworkResponse response)
{
long now = SystemClock.CurrentThreadTimeMillis();
Dictionary<String, String> headers = response.Headers;
long serverDate = 0;
long lastModified = 0;
long serverExpires = 0;
long softExpire = 0;
long finalExpire = 0;
long maxAge = 0;
long staleWhileRevalidate = 0;
bool hasCacheControl = false;
bool mustRevalidate = false;
String serverEtag = null;
String headerValue;
headers.TryGetValue("Date", out headerValue);
if (headerValue != null)
{
serverDate = ParseDateAsEpoch(headerValue);
}
headers.TryGetValue("Cache-Control", out headerValue);
if(headerValue != null)
{
hasCacheControl = true;
String[] tokens = headerValue.Split(',');
for (int i = 0; i < tokens.Length; i++)
{
String token = tokens[i].Trim();
if (token == "no-cache" || token == "no-store")
{
return null;
}
else if (token.StartsWith("max-age="))
{
try
{
maxAge = long.Parse(token.Substring(8));
}
catch (Exception) { }
}
else if (token.StartsWith("stale-while-revalidate="))
{
try
{
staleWhileRevalidate = long.Parse(token.Substring(23));
}
catch (Exception) { }
}
else if (token == "must-revalidate" || token == "proxy-revalidate")
{
mustRevalidate = true;
}
}
}
headers.TryGetValue("Expires", out headerValue);
if (headerValue != null)
{
serverExpires = ParseDateAsEpoch(headerValue);
}
headers.TryGetValue("Last-Modified", out headerValue);
if (headerValue != null)
{
lastModified = ParseDateAsEpoch(headerValue);
}
headers.TryGetValue("ETag", out serverEtag);
if (hasCacheControl)
{
softExpire = now + maxAge * 1000;
finalExpire = mustRevalidate ? softExpire : softExpire + staleWhileRevalidate * 1000;
}
else if (serverDate > 0 && serverExpires >= serverDate)
{
softExpire = now + (serverExpires - serverDate);
finalExpire = softExpire;
}
Entry entry = new Entry();
entry.Data = response.Data;
entry.ETag = serverEtag;
entry.SoftTtl = softExpire;
entry.Ttl = finalExpire;
entry.ServerDate = serverDate;
entry.LastModified = lastModified;
entry.ResponseHeaders = headers;
return entry;
}
/// <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 override Response ParseNetworkResponse(NetworkResponse response)
{
return(null);
}
public AuthFailureError(NetworkResponse response)
: base(response)
{
}
public NetworkError(NetworkResponse networkResponse)
: base(networkResponse)
{
}
public ParseError(NetworkResponse networkResponse)
: base(networkResponse)
{
}
public abstract Response ParseNetworkResponse(NetworkResponse response);