rest - WCF Web Service Hosted in SharePoint 2010 browser blank page response -

i'm facing problem sharepoint 2010 custom web service. service svc installed , deployed on system: without particular configuration works need customize web.config achieve security roles.

the problems when try invoke methods browser response empty.

this web.config

<?xml version="1.0"?> <configuration> <system.servicemodel> <services> <service name="sharepointwcfservice.getlistdata"  behaviorconfiguration="wcfbasichttpbinding.service1behavior"> <endpoint address="http://address" binding="basichttpbinding" contract="sharepointwcfservice.igetlistdata"> <identity> <dns value="localhost"/> </identity> </endpoint> <endpoint address="mex" binding="mexhttpbinding" contract="imetadataexchange"/>  <endpoint address="http://address" binding="webhttpbinding" contract="sharepointwcfservice.igetlistdata" >           <identity>             <dns value="localhost" />           </identity>         </endpoint> </service>  </services>  <behaviors>  <servicebehaviors>  <behavior name="wcfbasichttpbinding.service1behavior"> <servicemetadata httpgetenabled="true"/>  <servicedebug includeexceptiondetailinfaults="true"/>  </behavior>  </servicebehaviors>  </behaviors>  </system.servicemodel>   </configuration> 

this interface i'm implementing:

[servicecontract]  public interface igetlistdata  {    [operationcontract]    [webinvoke(method = "get", bodystyle = webmessagebodystyle.bare, responseformat = webmessageformat.json, requestformat = webmessageformat.json)]    jsonresult getjsonresponse(string data); 

}

and class

[basichttpbindingservicemetadataexchangeendpointattribute] [aspnetcompatibilityrequirements(requirementsmode = aspnetcompatibilityrequirementsmode.required)] class getlistdata : igetlistdata {     private const string admin_svc_getlistdata = "admin_svc_getlistdata";      public jsonresult getjsonresponse(string data)     {         return new jsonresult()         {             firstname = "myfirstname",             lastname = "mylastname"         };     } //  public jsonresult getjsonresponse(string data) 

do must declare different @ web.config side?