*
* @Route("/export/{id}.{format}", name="export_entry", requirements={
* "format": "epub|mobi|pdf|json|xml|txt|csv",
* "id": "\d+"
* })
*
* @Route("/export/{id}.{format}", name="export_entry", requirements={
* "format": "epub|mobi|pdf|json|xml|txt|csv",
* "id": "\d+"
* })
* @Route("/export/{category}.{format}", name="export_entries", requirements={
* "format": "epub|mobi|pdf|json|xml|txt|csv",
* "category": "all|unread|starred|archive"
* })
* @Route("/export/{category}.{format}", name="export_entries", requirements={
* "format": "epub|mobi|pdf|json|xml|txt|csv",
* "category": "all|unread|starred|archive"
* })