Apache provides a number of monitoring and logging facilities to track the correct operation of the server. The default Apache configuration provides two log files, placed inside the logs directory of the installation directory:
The access_log file (access.log in Windows) contains information about the requests that have been served by the server, such as the URL requested, the IP address of the client, and whether the request completed successfully or not.
The error_log file (error.log in Windows) contains information related to error conditions, as well as different events in the lifecycle of the server.