Webconfig httphandlers Invalid resolution processing

There is a site is based on Integrated mode development, but hard to hang in the Classic mode of the father of the site below, it is necessary to make the corresponding changes, the basic is handlers change httphandlers,modules for httpmodules, from the node <system.webserver > moved to <system.web>, but how to change can not enter the custom handler inside, reference below is not.

Http://msdn.microsoft.com/en-us/library/vstudio/46c5ddfy (v=vs.100). aspx

http://msdn.microsoft.com/en-us/library/vstudio/ms228090 (v=vs.100). aspx

Http://www.cnblogs.com/songshch/p/HTTPHandlers--Config.html

The third URL also omitted a <Handlers> configuration section,

Finally, in a compromise, the new application pool-> set to Integrated mode-> applied to the subweb-> plus the following sentence to prevent the webconfig conflict with the parent site

<validation validateintegratedmodeconfiguration= "false"/>

The last configuration section is as follows: "*.jsloader" is a virtual Web site, if you know why the Classic mode of configuration is not possible, I can write a wrong word, please inform

  <system.webServer>
 	<validation validateintegratedmodeconfiguration= "false"/>