Refactored how all requests are handled by VaadinServlet and VaadinPortlet (#11192)
* Handling is now based on a list of RequestHandlers in VaadinService
* Request handling logic has been moved to VaadinService
* Users can customize the list by adding own (service level) request handlers
* For users specific request handlers you can still use the request handlers in VaadinSession
* Deprecated RequestType - all handlers are given the opportunity to handle a request until one of them chooses to handle it. RequestType makes no sense as it does not tell which handler will handle the request.
* Removed serveStaticResource which has never been used
Change-Id: Ia7d088535e46430ca8adf631d3f1dd944b9d51e2
Fixed locking in RequestHandlers and documented that RequestHandlers are called without locking (#9945)
* Added SynchronizedRequestHandler which locks the session for the whole request
* Made request handlers which do not do do heavy IO implement SynchronizedRequestHandler
* Fixed locking for GlobalResourceHandler, ConnectorResourceHandler, PublishedFileHandler
Change-Id: I0e7b442a9392828f1930685f194dc4f898d0f525
Don't let /APP requests continue to the BootstrapHandler (#9553)
* Change ApplicationConstants.APP_REQUEST_PATH to not include an ending
slash so it can be used by the new check as well.
Change-Id: If613e339b0e1ef4fd9e4f07d7567cd381678b912