When testing client-server interaction or exploring new functions, it may be useful to have more information inside the log file. We will now raise the verbosity of GeoServer:
Click on the Global link in the Settings menu.
Scroll down to the Logging Profile section.
Now change the Logging Profile setting to VERBOSE_LOGGING:
Click on GeoServer Logs in About & Status to review the logs. Optionally, review the log from the filesystem, /data_dir/logs/geoserver.log.
You just switched GeoServer to logging in verbose mode. Remember to remove this option when you are no longer testing functionalities since it stresses the server and requires a lot of space on the log file.