<?xml version="1.0" encoding="utf-8"?>+
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->+
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<!-- This component and the accompanying materials are made available under the terms of the License +
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"Eclipse Public License v1.0" which accompanies this distribution, +
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->+
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<!-- Initial Contributors:+
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    Nokia Corporation - initial contribution.+
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Contributors: +
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-->+
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<!DOCTYPE concept+
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">+
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<concept id="GUID-00552575-AB10-4CB3-A37B-D83AE5975811" xml:lang="en"><title>HTTP+
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session ID</title><prolog><metadata><keywords/></metadata></prolog><conbody>+
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<p>HTTP session ID is an optional non-negative integer which is attached to+
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the session and any sockets it creates. The session ID is set on sockets by+
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using <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-0DD7A667-7043-3D6B-A086-32DD222C199B"><apiname>RSocket::SetOpt()</apiname></xref>. </p>+
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<p>With this session ID, clients can specify an integer ID for an HTTP session,+
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which is assigned to subsequent sockets. An ID that is set applies to subsequent+
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socket connections. </p>+
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<p>HTTP session ID can be accessed using a Flow hook implementing the <codeph>SetFlowOption()</codeph> method,+
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which is called whenever <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-0DD7A667-7043-3D6B-A086-32DD222C199B"><apiname>RSocket::SetOpt()</apiname></xref> is called. The+
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Flow hook helps determine if a socket came from a specific session. </p>+
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<p>The session ID is set when the socket is created and is not changed. To+
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find the session ID of a socket, the flow object must look for Set Option+
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commands that request setting session ID. The ID that is set can be saved+
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in the Flow hook object, and used later when needed. This can be done using+
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an <codeph>iSessionId</codeph> variable to hold the value, as shown in the+
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following example: </p>+
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<codeblock id="GUID-11827E76-ECD4-52E7-89B0-0152A4CF5A47" xml:space="preserve">#include &lt;HTTPSocketConstants.h&gt; // option consts defined here.... +
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class CMip4Protocol : public CIp6Hook +
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{ +
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public: +
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... +
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virtual TInt SetFlowOption(TUint aLevel, TUint aName, const TDesC8 &amp;aOption, CFlowContext &amp;aFlow); +
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private: +
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...+
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TInt iSessionId; // session ID is stored here. Should be initialized to KErrNotFound+
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};</codeblock>+
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<p>The HTTP session ID, <codeph>HTTP::ESessionId</codeph>, when set, is accessed+
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using the session’s connection info object. For example: </p>+
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<codeblock id="GUID-E46A1152-E4CC-5FFE-8686-68605C6D4909" xml:space="preserve">RHTTPSession session;+
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...+
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RHTTPConnectionInfo ConnectionInfo = session.ConnectionInfo();+
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</codeblock>+
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<p>To access the value, <codeph>RString</codeph> must first be extracted from+
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the string pool. For example: </p>+
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<codeblock id="GUID-C833CEEC-A8E8-5687-8F47-C1836FCD0933" xml:space="preserve">RStringF sessionId = session.StringPool().StringF(HTTP::ESessionId, RHTTPSession::GetTable());+
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sessionId.Close();</codeblock>+
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</conbody></concept>+
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