HttpHandlers and HttpModule

Listing 2. HttpHandlers and an HttpModule play important roles in retrieving scripts and processing AJAX requests and responses.

<httpHandlers>
  <remove verb="*" path="*.asmx"/>
  <add verb="*" path="*.asmx" validate="false" 
    type="System.Web.Script.Services.ScriptHandlerFactory, 
    System.Web.Extensions, ..."/>
  <add verb="*" path="*_AppService.axd" validate="false" 
    type="System.Web.Script.Services.ScriptHandlerFactory, 
    System.Web.Extensions, ..."/>
  <add verb="GET,HEAD" path="ScriptResource.axd" 
    type="System.Web.Handlers.ScriptResourceHandler, 
    System.Web.Extensions, ..." validate="false"/>
</httpHandlers>

<httpModules>
  <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, 
    System.Web.Extensions, ..."/>
</httpModules>