Pier 2: ? in resfull url's

Hello, When I switch my pier 2 website to use session cookies I get nice restful URL's. Only there is a question mark behind the URL even if there are no query parameters. I tracked this down to the WUrl>>purgeSeasideFields method. The question marks disappears when I change the method to: purgeSeasideFields self queryFields keys do: [ :each | (self isSeasideField: each) ifTrue: [ self queryFields removeKey: each ifAbsent: [ ]. self queryFields isEmpty ifTrue: [ self queryFields: nil ] ] ] It is also possible to change the WAUrl>>encodeOn: method to check for an empty queryFields collection. Jan.