The amount of URI text that is stored in Cisco WSA log files is controlled by the log-entry size parameter, which can be configured using the advancedproxyconfig command. The log-entry size parameter specifies the maximum number of bytes of the URI that will be logged for each request. The default value is 1024 bytes, but it can be changed to any value between 1 and 4096 bytes. If the URI is longer than the log-entry size, it will be truncated and a plus sign (+) will be appended to indicate that the URI was cut off. Configuring a small log-entry size can reduce the disk space and bandwidth consumption of the log files, but it can also limit the visibility and analysis of the requests.
References :=
* User Guide for AsyncOS 11.0 for Cisco Web Security Appliances, Customizing Access Logs
* Cisco WSA CLI Reference Guide for AsyncOS 11.0, advancedproxyconfig Command
* WSA FAQ: How can I view the logs on the Cisco WSA? - Cisco