.. _arch_overview_access_logs: Access logging =================== The :ref:`HTTP connection manager ` and :ref:`tcp proxy ` supports extensible access logging with the following features: * Any number of access logs per connection manager or tcp proxy. * Asynchronous IO flushing architecture. Access logging will never block the main network processing threads. * Customizable access log formats using predefined fields as well as arbitrary HTTP request and response headers. * Customizable access log filters that allow different types of requests and responses to be written to different access logs. Access log :ref:`configuration `.