Provides the functionality intercepting the page request (HTTP or XHR).

It depends on installation of Page Extensions and provides following methods:

• getRequestTypeDone() - obtains the last request intercepted by code in Page Extensions

• clearRequestTypeDone() - clears the last request (sets the NONE) and returns the last request type set

• waitForRequestTypeChange() - waits until the request done will change to value other than NONE