Cisco Cisco Web Security Appliance S160 Guía Del Usuario
20-25
AsyncOS 8.5 for Cisco Web Security Appliances User Guide
Chapter 20 Monitor System Activity Through Logs
W3C Compliant Access Log Files
Related Topics
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W3C Compliant Access Log Files
The Web Security appliance provides two different log types for recording Web Proxy transaction
information: access logs and W3C access logs. W3C access logs are W3C compliant, and record
transaction history in the W3C Extended Log File (ELF) Format.
information: access logs and W3C access logs. W3C access logs are W3C compliant, and record
transaction history in the W3C Extended Log File (ELF) Format.
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W3C Field Types
When defining a W3C access log subscription, you must choose which log fields to include, such as the
ACL decision tag or the client IP address. You can include one of the following types of log fields:
ACL decision tag or the client IP address. You can include one of the following types of log fields:
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Predefined. The web interface includes a list of fields from which you can choose.
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User defined. You can type a log field that is not included in the predefined list.
Interpreting W3C Access Logs
Consider the following rules and guidelines when interpreting W3C access logs:
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Administrators decide what data is recorded in each W3C access log subscription; therefore, W3C
access logs have no set field format.
access logs have no set field format.
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W3C logs are self-describing. The file format (list of fields) is defined in a header at the start of each
log file.
log file.
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Fields in the W3C access logs are separated by a white space.
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If a field contains no data for a particular entry, a hyphen ( - ) is included in the log file instead.
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Each line in the W3C access log file relates to one transaction, and each line is terminated by a LF
sequence.
sequence.
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W3C Log File Headers
Each W3C log file contains header text at the beginning of the file. Each line starts with the # character
and provides information about the Web Security appliance that created the log file. The W3C log file
headers also include the file format (list of fields), making the log file self-describing.
and provides information about the Web Security appliance that created the log file. The W3C log file
headers also include the file format (list of fields), making the log file self-describing.