In dev mode, all pages try several times to get _wdt/<some_token> via XHR.
_wdt/<some_token> reponds with 404.
but if I try to get _wdt/<some_token> directly afterwards, _wdt/<some_token> reponds with 200 OK.
After a few 404, Sf displays an alert window providing access to profiler which fails generally the first time (404) but works fine after a refresh.
It seems related to web developer toolbar but wdt sometimes appears even with those 404 errors.
Routes are correctly configured in routing_dev pointing to wdt. espublish/logs/dev.log :  
request.INFO: Matched route "_wdt" parameters: "_controller": "web_profiler.controller.profiler:toolbarAction", "token": "09cfe9" ...
I'm using ezpublish 2014.11 and apache 2 using the documented eZ Publish vhost configuration.
Any idea on how to prevent this ?