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diff --git a/Source/WebKit2/NetworkProcess/NetworkDataTask.h b/Source/WebKit2/NetworkProcess/NetworkDataTask.h
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+++ b/Source/WebKit2/NetworkProcess/NetworkDataTask.h
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+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef NetworkDataTask_h
+#define NetworkDataTask_h
+
+#include <WebCore/FrameLoaderTypes.h>
+#include <WebCore/ResourceHandleTypes.h>
+#include <WebCore/ResourceLoaderOptions.h>
+#include <WebCore/ResourceRequest.h>
+#include <WebCore/Timer.h>
+#include <wtf/RetainPtr.h>
+#include <wtf/text/WTFString.h>
+
+#if PLATFORM(COCOA)
+OBJC_CLASS NSURLSessionDataTask;
+#endif
+
+namespace WebCore {
+class AuthenticationChallenge;
+class Credential;
+class ResourceError;
+class ResourceRequest;
+class ResourceResponse;
+class SharedBuffer;
+}
+
+namespace WebKit {
+
+class NetworkSession;
+class PendingDownload;
+
+enum class AuthenticationChallengeDisposition {
+    UseCredential,
+    PerformDefaultHandling,
+    Cancel,
+    RejectProtectionSpace
+};
+    
+typedef std::function<void(const WebCore::ResourceRequest&)> RedirectCompletionHandler;
+typedef std::function<void(AuthenticationChallengeDisposition, const WebCore::Credential&)> ChallengeCompletionHandler;
+typedef std::function<void(WebCore::PolicyAction)> ResponseCompletionHandler;
+
+class NetworkDataTaskClient {
+public:
+    virtual void willPerformHTTPRedirection(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, RedirectCompletionHandler) = 0;
+    virtual void didReceiveChallenge(const WebCore::AuthenticationChallenge&, ChallengeCompletionHandler) = 0;
+    virtual void didReceiveResponseNetworkSession(const WebCore::ResourceResponse&, ResponseCompletionHandler) = 0;
+    virtual void didReceiveData(RefPtr<WebCore::SharedBuffer>&&) = 0;
+    virtual void didCompleteWithError(const WebCore::ResourceError&) = 0;
+    virtual void didBecomeDownload() = 0;
+    virtual void didSendData(uint64_t totalBytesSent, uint64_t totalBytesExpectedToSend) = 0;
+    virtual void wasBlocked() = 0;
+    virtual void cannotShowURL() = 0;
+    
+    virtual ~NetworkDataTaskClient() { }
+};
+
+class NetworkDataTask : public RefCounted<NetworkDataTask> {
+    friend class NetworkSession;
+public:
+    static Ref<NetworkDataTask> create(NetworkSession& session, NetworkDataTaskClient& client, const WebCore::ResourceRequest& request, WebCore::StoredCredentials storedCredentials, WebCore::ContentSniffingPolicy shouldContentSniff, bool shouldClearReferrerOnHTTPSToHTTPRedirect)
+    {
+        return adoptRef(*new NetworkDataTask(session, client, request, storedCredentials, shouldContentSniff, shouldClearReferrerOnHTTPSToHTTPRedirect));
+    }
+    
+    void suspend();
+    void cancel();
+    void resume();
+    
+    typedef uint64_t TaskIdentifier;
+    TaskIdentifier taskIdentifier();
+    
+    ~NetworkDataTask();
+    
+    NetworkDataTaskClient& client() { return m_client; }
+    
+    DownloadID pendingDownloadID() { return m_pendingDownloadID; }
+    PendingDownload* pendingDownload() { return m_pendingDownload; }
+    void setPendingDownloadID(DownloadID downloadID)
+    {
+        ASSERT(!m_pendingDownloadID.downloadID());
+        ASSERT(downloadID.downloadID());
+        m_pendingDownloadID = downloadID;
+    }
+    void setPendingDownload(PendingDownload& pendingDownload)
+    {
+        ASSERT(!m_pendingDownload);
+        m_pendingDownload = &pendingDownload;
+    }
+    bool tryPasswordBasedAuthentication(const WebCore::AuthenticationChallenge&, ChallengeCompletionHandler);
+    void willPerformHTTPRedirection(const WebCore::ResourceResponse&, WebCore::ResourceRequest&&, RedirectCompletionHandler);
+    
+private:
+    NetworkDataTask(NetworkSession&, NetworkDataTaskClient&, const WebCore::ResourceRequest&, WebCore::StoredCredentials, WebCore::ContentSniffingPolicy, bool shouldClearReferrerOnHTTPSToHTTPRedirect);
+    
+    enum FailureType {
+        NoFailure,
+        BlockedFailure,
+        InvalidURLFailure
+    };
+    FailureType m_scheduledFailureType { NoFailure };
+    WebCore::Timer m_failureTimer;
+    void failureTimerFired();
+    void scheduleFailure(FailureType);
+    
+    NetworkSession& m_session;
+    NetworkDataTaskClient& m_client;
+    PendingDownload* m_pendingDownload { nullptr };
+    DownloadID m_pendingDownloadID;
+    String m_user;
+    String m_password;
+    String m_lastHTTPMethod;
+    WebCore::ResourceRequest m_firstRequest;
+    bool m_shouldClearReferrerOnHTTPSToHTTPRedirect;
+#if PLATFORM(COCOA)
+    RetainPtr<NSURLSessionDataTask> m_task;
+#endif
+};
+
+#if PLATFORM(COCOA)
+WebCore::Credential serverTrustCredential(const WebCore::AuthenticationChallenge&);
+#endif
+    
+}
+
+#endif