Got it.
# app/config/config.yml
# ...
fos_rest:
routing_loader:
default_format: json
include_format: true
param_fetcher_listener: force
body_listener: true
allowed_methods_listener: true
view:
view_response_listener: 'force'
formats:
json: true
xml: true
format_listener:
rules:
- { path: '^/api', priorities: ['json', 'xml'], fallback_format: json, prefer_extension: true }
sensio_framework_extra:
view: { annotations: false }
router: { annotations: true }
# ...