Response text ireturns empty in wcf service

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WCF

hi
I write one wcf service in c#.net. I call the service through the AJAX request model.
In service succes i did not get the response text, the response text is returns as empty. I run the service in browser and there also returns empty. This particular service are having 28292 records. But all other services are running perfect in Ajax request and returns below 1000 records. I found out the error is in webconfig, but i dont know how can i resolve that. My webconfig is given below.

 <behaviors>
      <serviceBehaviors>
        <behavior name="iPadReportServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="iPadReportServiceBehavior">
          <webHttp/>
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <bindings>
      <basicHttpBinding>
        <binding name="iPadReportServiceBinding" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" allowCookies="true" transferMode="Streamed">
          <readerQuotas maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxStringContentLength="2147483647"/>
        </binding>
      </basicHttpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="iPadReportServiceBehavior" name="iPadReportService">
        <endpoint address="" binding="webHttpBinding" behaviorConfiguration="iPadReportServiceBehavior" contract="IiPadReportService" >
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>


Please give me a quick results