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<concept id="GUID-4ACEA6B0-CA7C-5751-A1B6-283287552A31" xml:lang="en"><title>HTTP

Whole Message Filter Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-F92DE930-90BF-4292-8832-02BA1309E09D"><title>Purpose</title> <p>The HTTP Whole Message Filter APIs makes

it easier for mobile browser developers to meet the needs of the mobile network

operators who support specific Web Accelerators. This results in a faster

and much improved Web browsing experience. </p> </section>

<section id="GUID-63F035E3-36B3-494C-95A3-33956B54E1E9"><title>Required background</title> <p>Users of this API must be familiar

with the HTTP Transport Framework and the Web Acceleration protocol to be

implemented. </p> </section>

<section id="GUID-DC4C88D2-34BF-4704-ACED-DEAFACA6859C"><title>Key concepts</title> <p>The following are the key concepts

that are associated with HTTP Whole Message Filter APIs: </p> <dl>

<dlentry>

<dt>HTTP Whole Message Filter APIs</dt>

<dd><p>Enables you to insert a filter into an HTTP session or an individual

transaction when the complete message is formed and before the message is

being dispatched. The APIs also operate on incoming HTTP responses before

the actual parsing of the HTTP response happens. The use of the HTTP Whole

Message Filter APIs enable you to achieve Web Acceleration on Symbian platform

based mobile browser applications. </p> </dd>

</dlentry>

<dlentry>

<dt>Web Acceleration</dt>

<dd><p>The process of optimising the HTTP data to enhance the speed at which

data is transferred over the mobile network. Web Acceleration is achieved

by the use of encoding and decoding mechanisms supported by the HTTP Whole

Message Filter APIs. The HTTP Whole Message Filter APIs are included as part

of the HTTP Protocol Handler in the HTTP Transport Framework. </p> </dd>

</dlentry>

<dlentry>

<dt> Encoding mechanism</dt>

<dd><p>This mechanism converts the HTTP request data to a network optimisation

protocol format before it is sent across the TCP connection. </p> </dd>

</dlentry>

<dlentry>

<dt> Decoding mechanism</dt>

<dd><p>This mechanism converts the HTTP response data in the network optimisation

protocol format back to the standard HTTP response data format. </p> </dd>

</dlentry>

</dl> </section>

<section id="GUID-46189E5D-A350-40E0-AC0D-37BA69D211A6"><title>API Summary</title> <p>The following table lists the HTTP

Whole Message Filter APIs that are included in the HTTP Transport Framework

to enable Web Acceleration support on a Symbian platform based mobile browser

application: </p> <table id="GUID-41857A21-0437-5FC8-9844-83861501B6D1">

<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

<tbody>

<row>

<entry><p> <b>API</b>  </p> </entry>

<entry><p> <b>Description</b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>MHTTPDataOptimiser</codeph>  </p> </entry>

<entry><p>An interface that can be derived to implement custom encoding and

decoding mechanisms. </p> </entry>

</row>

<row>

<entry><p> <b>Functions included in the MHTTPDataOptimiser interface </b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>EncodeL(…) </codeph>  </p> </entry>

<entry><p>Converts the HTTP request data to a network optimisation protocol

format. </p> </entry>

</row>

<row>

<entry><p> <codeph> DecodeL(…) </codeph>  </p> </entry>

<entry><p>Converts the HTTP response data in the network optimisation protocol

format back to the standard HTTP response data format. </p> </entry>

</row>

<row>

<entry><p> <b>Functions included in the RHTTPSession class </b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>RHTTPSession::SetupHTTPDataOptimiser                  

(MHTTPDataOptimiser&amp; aHTTPOmtimiser);</codeph>  </p> </entry>

<entry><p>Sets the <codeph>MHTTPDataOptimiser</codeph> reference for the session

object. </p> </entry>

</row>

<row>

<entry><p> <codeph>MHTTPDataOptimiser* RHTTPSession::HTTPDataOptimiser   

               ();</codeph>  </p> </entry>

<entry><p>Returns a pointer to the <codeph>MHTTPDataOptimiser</codeph> implementation

object. </p> </entry>

</row>

<row>

<entry><p> <b>Functions included in the RHTTPTransaction class </b>  </p> </entry>

</row>

<row>

<entry><p> <codeph>RHTTPTransaction::SetupHTTPDataOptimiser              

    (MHTTPDataOptimiser&amp; aHTTPOmtimiser);</codeph>  </p> </entry>

<entry><p>Sets the <codeph>MHTTPDataOptimiser</codeph> reference for the transaction

object. </p> </entry>

</row>

<row>

<entry><p> <codeph>MHTTPDataOptimiser* RHTTPTransaction::HTTPDataOptimiser

                  ();</codeph>  </p> </entry>

<entry><p>Returns a pointer to the <codeph>MHTTPDataOptimiser</codeph> implementation

object. </p> </entry>

</row>

</tbody>

</tgroup>

</table> </section>

</conbody><related-links>

<link href="GUID-F0ABCDE5-F818-526A-81EB-E2D4D87E3231.dita"><linktext>How to Use

the HTTP                 Whole Message Filter APIs</linktext></link>

<link href="GUID-B4A54501-4AA4-5ACB-96D7-4427C7752639.dita"><linktext>Using HTTP

Client</linktext></link>