author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:09:52 +0200 | |
changeset 0 | b16258d2340f |
permissions | -rw-r--r-- |
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// Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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#include <e32std.h> |
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#include "redirect.h" |
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#include <uri8.h> |
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#include <delimitedpath8.h> |
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#include <delimitedquery8.h> |
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#include <http/rhttptransaction.h> |
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#include <http/rhttpheaders.h> |
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#include <httpstringconstants.h> |
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#include <httperr.h> |
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#include "corefilterspanic.h" |
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#include <escapeutils.h> |
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const TInt KRedirectLimit = 8; // Maximum level of redirection to stop infinite circular redirection |
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CRedirectFilter::CRedirectFilter(RHTTPSession aSession) |
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: iSession(aSession), iStringTable(RHTTPSession::GetTable()) |
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{ |
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} |
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CEComFilter* CRedirectFilter::InstallFilterL(TAny* aSession) |
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{ |
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RHTTPSession* session = REINTERPRET_CAST(RHTTPSession*, aSession); |
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CRedirectFilter* filter = new (ELeave) CRedirectFilter(*session); |
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CleanupStack::PushL(filter); |
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filter->ConstructL(*session); |
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CleanupStack::Pop(filter); |
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return filter; |
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} |
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void CRedirectFilter::ConstructL(RHTTPSession aSession) |
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{ |
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iStringPool = aSession.StringPool(); |
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// Register the filter. |
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// 301 Moved Permanently |
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aSession.FilterCollection().AddFilterL(*this, THTTPEvent::EGotResponseHeaders, RStringF(), |
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301, EStatusCodeHandler, iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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// 302 Found (deprecated, same as 307) |
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aSession.FilterCollection().AddFilterL(*this, THTTPEvent::EGotResponseHeaders, RStringF(), |
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302, EStatusCodeHandler, iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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// 303 See other |
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aSession.FilterCollection().AddFilterL(*this, THTTPEvent::EGotResponseHeaders, RStringF(), |
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303, EStatusCodeHandler, iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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// 307 Moved Temporarily |
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aSession.FilterCollection().AddFilterL(*this, THTTPEvent::EGotResponseHeaders, RStringF(), |
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307, EStatusCodeHandler, iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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// Exceptional Cases which require special handling |
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// 305 Use Proxy |
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aSession.FilterCollection().AddFilterL(*this, THTTPEvent::EGotResponseHeaders, RStringF(), |
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305, EStatusCodeHandler, iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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// 304 This should be entirely handled by the client as it is only used in conditional get cases, so only the client |
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// would know what to do |
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} |
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CRedirectFilter::~CRedirectFilter() |
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{ |
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// If we've been destroyed from the cleanup stack during creation |
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// of the object, it might still be loaded. So check. (Normaly the |
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// delete is initiated by the 'delete this' in MHFUnload) |
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if (iLoadCount) |
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{ |
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// As we're already in a destructor, MHFUnload must not delete us again |
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iLoadCount = -1; |
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iSession.FilterCollection(). |
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RemoveFilter(iStringPool.StringF(HTTP::ERedirect,iStringTable)); |
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} |
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} |
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void CRedirectFilter::MHFLoad(RHTTPSession, THTTPFilterHandle) |
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{ |
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++iLoadCount; |
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} |
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void CRedirectFilter::MHFUnload(RHTTPSession /*aSession*/, THTTPFilterHandle) |
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{ |
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if (--iLoadCount) |
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return; |
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delete this; |
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} |
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void CRedirectFilter::MHFRunL(RHTTPTransaction aTransaction, |
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const THTTPEvent& /*aEvent*/) |
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{ |
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|
103 |
|
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|
104 |
switch (aTransaction.Response().StatusCode()) |
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|
105 |
{ |
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|
106 |
case 301: |
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|
107 |
HandleRedirectL(aTransaction,THTTPEvent::ERedirectedPermanently); |
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|
108 |
break; |
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|
109 |
case 302: |
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|
110 |
case 303: |
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|
111 |
case 307: |
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|
112 |
HandleRedirectL(aTransaction,THTTPEvent::ERedirectedTemporarily); |
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|
113 |
break; |
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|
114 |
case 305: |
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|
115 |
HandleUseProxyL(aTransaction); |
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|
116 |
break; |
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|
117 |
default: |
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|
118 |
break; |
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|
119 |
} |
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120 |
} |
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|
121 |
|
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|
122 |
TInt CRedirectFilter::MHFRunError(TInt /*aError*/, |
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123 |
RHTTPTransaction aTransaction, |
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124 |
const THTTPEvent& /*aEvent*/) |
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125 |
{ |
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126 |
// If anything left, we've run out of memory or something |
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127 |
// similarly catastrophic has gone wrong. |
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128 |
aTransaction.Fail(); |
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129 |
return KErrNone; |
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130 |
} |
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|
131 |
|
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|
132 |
void CRedirectFilter::MHFSessionRunL(const THTTPSessionEvent& /*aEvent*/) |
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133 |
{ |
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|
134 |
} |
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|
135 |
|
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136 |
TInt CRedirectFilter::MHFSessionRunError(TInt aError, const THTTPSessionEvent& /*aEvent*/) |
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137 |
{ |
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|
138 |
return aError; |
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139 |
} |
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|
140 |
|
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|
141 |
void CRedirectFilter::HandleRedirectL(RHTTPTransaction aTransaction, THTTPEvent::TTransactionWarning aWarningEvent) |
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142 |
{ |
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|
143 |
|
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|
144 |
TInt redirectCount = 0; |
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145 |
RStringPool p = aTransaction.Session().StringPool(); |
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|
146 |
|
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147 |
// see if this transaction has been redirected before |
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|
148 |
THTTPHdrVal redirectCountProperty; |
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|
149 |
if (aTransaction.PropertySet().Property(p.StringF(HTTP::ERedirectCount,iStringTable), |
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|
150 |
redirectCountProperty)) |
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|
151 |
{ |
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152 |
__ASSERT_DEBUG(redirectCountProperty.Type() == THTTPHdrVal::KTIntVal, |
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|
153 |
TFCoreFiltersPanic::Panic(TFCoreFiltersPanic::EInvalidRedirectCountProperty)); |
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|
154 |
redirectCount = redirectCountProperty.Int(); |
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|
155 |
__ASSERT_DEBUG(redirectCount > 0, TFCoreFiltersPanic::Panic(TFCoreFiltersPanic::EInvalidRedirectCountProperty)); |
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|
156 |
} |
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|
157 |
|
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|
158 |
TInt maxNumberOfRedirects = KRedirectLimit; |
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|
159 |
THTTPHdrVal maxRedirect; |
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|
160 |
if (aTransaction.Session().ConnectionInfo().Property(p.StringF(HTTP::EMaxRedirect,iStringTable), maxRedirect)) |
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|
161 |
{ |
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|
162 |
__ASSERT_DEBUG(maxRedirect.Type() == THTTPHdrVal::KTIntVal, |
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|
163 |
TFCoreFiltersPanic::Panic(TFCoreFiltersPanic::EInvalidMaxRedirectProperty)); |
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parents:
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|
164 |
maxNumberOfRedirects = maxRedirect.Int(); |
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parents:
diff
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|
165 |
__ASSERT_DEBUG(maxNumberOfRedirects > 0, |
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parents:
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|
166 |
TFCoreFiltersPanic::Panic(TFCoreFiltersPanic::EInvalidMaxRedirectProperty)); |
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parents:
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|
167 |
} |
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Revision: 201003
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parents:
diff
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|
168 |
|
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parents:
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|
169 |
|
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Revision: 201003
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parents:
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|
170 |
// Only redirect a certain number of times, and update the redirect count property of the transaction |
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Revision: 201003
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parents:
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|
171 |
if (++redirectCount <= maxNumberOfRedirects) |
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|
172 |
{ |
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|
173 |
aTransaction.PropertySet().SetPropertyL(p.StringF(HTTP::ERedirectCount,iStringTable), redirectCount); |
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parents:
diff
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|
174 |
|
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|
175 |
RStringF location = p.StringF(HTTP::ELocation,iStringTable); |
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|
176 |
RHTTPHeaders responseHeaders(aTransaction.Response().GetHeaderCollection()); |
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Revision: 201003
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|
177 |
THTTPHdrVal locationValue; |
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|
178 |
|
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|
179 |
TInt err = responseHeaders.GetField(location, 0, locationValue); |
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|
180 |
if (err == KErrNotFound) // location not present when redirected |
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Revision: 201003
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|
181 |
aTransaction.SendEventL(KErrHttpRedirectNoLocationField,THTTPEvent::EIncoming,THTTPFilterHandle::ECurrentFilter); |
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|
182 |
else |
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|
183 |
{ |
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Revision: 201003
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|
184 |
User::LeaveIfError(err); |
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|
185 |
RHTTPRequest request = aTransaction.Request(); |
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|
186 |
RHTTPHeaders requestHeaders(request.GetHeaderCollection()); |
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Revision: 201003
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parents:
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|
187 |
requestHeaders.RemoveField(p.StringF(HTTP::EHost,iStringTable)); |
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Revision: 201003
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parents:
diff
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|
188 |
TUriParser8 uriParser; |
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Revision: 201003
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parents:
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|
189 |
uriParser.Parse( locationValue.StrF().DesC() ); |
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Revision: 201003
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parents:
diff
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|
190 |
SetRedirectUriL( request, uriParser ); |
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Revision: 201003
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parents:
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|
191 |
aTransaction.Cancel(); |
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Revision: 201003
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parents:
diff
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|
192 |
|
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Revision: 201003
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parents:
diff
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|
193 |
|
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Revision: 201003
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parents:
diff
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|
194 |
// 10.3.2 301 Moved Permanently: |
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Revision: 201003
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parents:
diff
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|
195 |
// The requested resource has been assigned a new permanent URI and any future references to this resource |
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Revision: 201003
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parents:
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|
196 |
// SHOULD use one of the returned URIs. If the 301 status code is received in response to a request |
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Revision: 201003
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parents:
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|
197 |
// other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed |
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Revision: 201003
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|
198 |
// by the user, since this might change the conditions under which the request was issued. |
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parents:
diff
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|
199 |
|
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parents:
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|
200 |
// 10.3.8 307 Temporary Redirect: |
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Revision: 201003
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parents:
diff
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|
201 |
// The requested resource resides temporarily under a different URI. Since the redirection MAY be |
b16258d2340f
Revision: 201003
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parents:
diff
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|
202 |
// altered on occasion, the client SHOULD continue to use the Request-URI for future requests. |
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Revision: 201003
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parents:
diff
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|
203 |
// This responseis only cacheable if indicated by a Cache-Control or Expires header field. |
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Revision: 201003
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parents:
diff
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|
204 |
|
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Revision: 201003
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diff
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|
205 |
// If the returned status code is 301 or 302 or 307 and the requested method is GET or HEAD,then the transaction |
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// is simply submitted. If not then the filter sends the client an event - ERedirectRequiresConfirmation |
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// Then Client has to make the decision either to submit the transaction with the |
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// new redirected URI or to close the transaction. |
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209 |
|
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TInt method = aTransaction.Request().Method().Index(iStringTable); |
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TInt statusCode = aTransaction.Response().StatusCode(); |
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212 |
|
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if( (statusCode == 301 || statusCode == 307) && |
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!((method==HTTP::EGET) || (method==HTTP::EHEAD)) ) |
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215 |
{ |
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aTransaction.SendEventL(THTTPEvent::ERedirectRequiresConfirmation,THTTPEvent::EIncoming,THTTPFilterHandle::ECurrentFilter); |
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217 |
} |
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218 |
else |
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219 |
{ |
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220 |
// 10.3.3 302 Found: |
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// The requested resource resides temporarily under a different URI. |
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// Since the redirection might be altered on occasion, the client |
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// SHOULD continue to use the Request-URI for future requests. This |
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// response is only cacheable if indicated by a Cache-Control or |
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// Expires header field. |
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// Note: RFC 1945 and RFC 2068 specify that the client is not allowed |
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// to change the method on the redirected request. However, most |
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// existing user agent implementations treat 302 as if it were a 303 |
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229 |
// response, performing a GET on the Location field-value regardless |
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// of the original request method. The status codes 303 and 307 have |
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// been added for servers that wish to make unambiguously clear which |
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// kind of reaction is expected of the client. |
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233 |
|
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234 |
|
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235 |
// 10.3.4 303 See Other |
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236 |
// The response to the request can be found under a different URI and |
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// SHOULD be retrieved using a GET method on that resource. |
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// The different URI SHOULD be given by the Location field in the |
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239 |
// response. Unless the request method was HEAD, the entity of the |
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240 |
// response SHOULD contain a short hypertext note with a hyperlink to |
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241 |
// the new URI(s). |
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242 |
if ( statusCode == 302 || statusCode == 303 ) |
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243 |
{ |
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244 |
requestHeaders.RemoveField(p.StringF(HTTP::EContentLength,iStringTable)); |
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245 |
requestHeaders.RemoveField(p.StringF(HTTP::EContentType,iStringTable)); |
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246 |
aTransaction.Request().RemoveBody(); |
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247 |
aTransaction.Response().RemoveBody(); |
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248 |
request.SetMethod(p.StringF(HTTP::EGET, iStringTable)); |
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249 |
} |
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250 |
aTransaction.SendEventL(aWarningEvent,THTTPEvent::EIncoming,THTTPFilterHandle::ECurrentFilter); |
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251 |
aTransaction.SubmitL(); |
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252 |
} |
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253 |
} |
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254 |
} |
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255 |
else // Possible circular redirection so pass on an error to the user |
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256 |
{ |
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257 |
aTransaction.SendEventL(KErrHttpRedirectExceededLimit,THTTPEvent::EIncoming,THTTPFilterHandle::ECurrentFilter); |
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258 |
} |
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259 |
|
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260 |
} |
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261 |
|
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262 |
|
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263 |
void CRedirectFilter::HandleUseProxyL(RHTTPTransaction aTransaction) |
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264 |
{ |
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265 |
__START_PERFORMANCE_LOGGER(); |
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266 |
aTransaction.SendEventL(KErrHttpRedirectUseProxy,THTTPEvent::EIncoming,THTTPFilterHandle::ECurrentFilter); |
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267 |
__END_PERFORMANCE_LOGGER(_L(",CValidationFilter::ValidateResponseStatusCode()")); |
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268 |
} |
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|
269 |
|
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270 |
|
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271 |
void CRedirectFilter::EscapeEncodeUriL ( CUri8& aUri ) const |
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272 |
{ |
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273 |
_LIT8 ( KCharsToEscape, " " ); |
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274 |
|
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275 |
const TUriC8& uri ( aUri.Uri() ); |
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276 |
if ( uri.IsPresent ( EUriPath ) ) |
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277 |
{ |
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278 |
HBufC8* escapedPath = EscapeUtils::SpecificEscapeEncodeL ( uri.Extract ( EUriPath ), KCharsToEscape ); |
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279 |
CleanupStack::PushL ( escapedPath ); |
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280 |
aUri.SetComponentL ( *escapedPath, EUriPath ); |
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281 |
CleanupStack::PopAndDestroy ( escapedPath ); |
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282 |
} |
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283 |
|
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284 |
if ( uri.IsPresent ( EUriQuery ) ) |
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285 |
{ |
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286 |
HBufC8* escapedQuery = EscapeUtils::SpecificEscapeEncodeL ( uri.Extract ( EUriQuery ), KCharsToEscape ); |
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287 |
CleanupStack::PushL ( escapedQuery ); |
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288 |
aUri.SetComponentL ( *escapedQuery, EUriQuery ); |
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289 |
CleanupStack::PopAndDestroy ( escapedQuery ); |
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290 |
} |
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291 |
} |
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292 |
|
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293 |
void CRedirectFilter::SetRedirectUriL(RHTTPRequest aRequest, const TUriC8& aUri) const |
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294 |
{ |
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295 |
CUri8* newUri = NULL; |
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296 |
|
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297 |
if (aUri.IsPresent(EUriHost)) |
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298 |
{ |
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299 |
newUri = CUri8::NewLC ( aUri ); |
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300 |
} |
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301 |
|
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302 |
else // the location field contained a relative Uri. |
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303 |
{ |
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304 |
newUri = CUri8::ResolveL(aRequest.URI(), aUri); |
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305 |
CleanupStack::PushL(newUri); |
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306 |
} |
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307 |
EscapeEncodeUriL ( *newUri ); |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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308 |
// Check for the fragment in the new uri. |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
309 |
// need to append if the fragment is present in the initial uri and not present in the redirected. |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
310 |
if ( aRequest.URI().IsPresent( EUriFragment ) && !newUri->Uri().IsPresent( EUriFragment ) ) |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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311 |
{ |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
312 |
newUri->SetComponentL ( aRequest.URI().Extract ( EUriFragment ), EUriFragment ); |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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313 |
} |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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314 |
aRequest.SetURIL(newUri->Uri()); |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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315 |
CleanupStack::PopAndDestroy(newUri); |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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316 |
} |
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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317 |
|
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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318 |
|
b16258d2340f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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319 |