for 'index_html' default views. This breaks things like Cookie Crumbler. And
yes, when you use a JavaScript XML-RPC library, the browser could include an
authentication cookie for CookieCrumbler.

Instead, do not clear REQUEST_METHOD but check for a xmlrpc.Response object
when initiating the variable that will cause 'index_html' views to be used.

This fixes Zope Collector issue #528.