Issue #1356 - Improve detection of the issuer of the request

src/plugin/SinkPolicy.inl

 #ifndef PASSTHROUGHAPP_SINKPOLICY_INL
 #define PASSTHROUGHAPP_SINKPOLICY_INL
 
 #if _MSC_VER > 1000
         #pragma once
 #endif // _MSC_VER > 1000
 
 #ifndef PASSTHROUGHAPP_SINKPOLICY_H
         #error SinkPolicy.inl requires SinkPolicy.h to be included first
 #endif
@@ skipping 365 matching lines @@
         }
         if (SUCCEEDED(hr))
         {
                 hr = pSink->QueryInterface(IID_IInternetBindInfo, reinterpret_cast<void**>(&spBindInfo));
                 ATLASSERT(SUCCEEDED(hr) && spBindInfo != 0);
         }
         if (SUCCEEDED(hr) && !handled)
         {
                 hr = pTargetProtocol->Start(szUrl, spSink, spBindInfo, grfPI, dwReserved);
         }
+        if (E_ABORT == hr && pSink->m_blockedInTransaction)
+        {
+                static_cast<Protocol*>(this)->m_shouldSupplyCustomContent = true;
+                pSink->m_spInternetProtocolSink->ReportProgress(BINDSTATUS_MIMETYPEAVAILABLE, L"text/html");
+                pSink->m_spInternetProtocolSink->ReportData(BSCF_FIRSTDATANOTIFICATION, 0, static_cast<ULONG>(g_blockedByABPPage.size()));
+                return S_OK;
+        }
         return hr;
 }
 
 
 template <class Protocol, class Sink>
 inline Sink* CustomSinkStartPolicy<Protocol, Sink>::GetSink(
         const Protocol* pProtocol)
 {
         return Protocol::ComObjectClass::GetSink(pProtocol);
 }
 
 template <class Protocol, class Sink>
 inline Sink* CustomSinkStartPolicy<Protocol, Sink>::GetSink() const
 {
         return GetSink(static_cast<const Protocol*>(this));
 }
 
 template <class Protocol, class Sink>
 inline Protocol* CustomSinkStartPolicy<Protocol, Sink>::GetProtocol(
         const Sink* pSink)
 {
         return Protocol::ComObjectClass::GetProtocol(pSink);
 }
 
 } // end namespace PassthroughAPP
 
 #endif // PASSTHROUGHAPP_SINKPOLICY_INL