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Although the default CLF format meets most log requirements, sometimes it is useful to be able to customize logging data For example, you may want to log the type of
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browsers that are accessing your site, so your Web design team can determine which type of browser-specific HTML to avoid or use Or, perhaps you want to know which Web sites are sending (that is, referring) visitors to your sites All this is accomplished quite easily in Apache The default logging module, mod_log_config, supports custom logging Custom formats are set with the LogFormat and CustomLog directives of the module A string is the format argument to LogFormat and CustomLog This format string can have both literal characters and special % format specifiers When literal values are used in this string, they are copied into the log file for each request The % specifiers, however, are replaced with corresponding values The special % specifiers are shown in Table 8-2
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Table 8-2 Special % Specifiers for Log Entries
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% Specifier %a %A %B %b %c Description Client IP address Server IP address Bytes sent, excluding HTTP headers; 0 for no byte sent Bytes sent, excluding HTTP headers; for no byte sent Connection status when response is done The X character is written if connection was aborted by the client before response could be completed If client uses keep-alive protocol, a + is written to show that connection was kept alive after the response until timeout A is written to signify that connection was closed after the response The contents of a cookie called mycookie The amount of time (in microseconds) taken to complete the response The contents of an environment variable called myenv The filename of the request The remote host that made the request The request protocol (for example, HTTP 1/1) The contents of IncomingHeader; that is, the header line(s) in the request sent to the server The i character at the end denotes that this is a client (incoming) header If the IdentityCheck directive is enabled and the client machine runs identd, then this is the identity information reported by the client
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Continued
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%{mycookie}C %D %{myenv}e %f %h %H %{ IncomingHeader }i
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Table 8-2 (continued)
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% Specifier %m %{ ModuleNote }n %{ OutgoingHeader }o Description The request method (GET, POST, PUT, and so on) The contents of the note ModuleNote from another module The contents of OutgoingHeader; that is, the header line(s) in the reply The o character at the end denotes that this is a server (outgoing) header The port to which the request was served The process ID of the child that serviced the request The query string The first line of the request Status returned by the server in response to the request Note that when the request gets redirected, the value of this format specifier is still the original request status If you want to store the redirected request status, use %>s instead Time of the request The format of time is the same as in CLF format The time, in the form given by format (You can also look at the man page of strftime on Unix systems) The time taken to serve the request, in seconds If the requested URL required a successful Basic HTTP authentication, then the username is the value of this format specifier The value may be bogus if the server returned a 401 status (Authentication Required) after the authentication attempt The URL path requested The name of the server or the virtual host to which the request came The server name per the UseCanonicalName directive
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%p %P %q %r %s
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%t %{format}t %T %u
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It is possible to include conditional information in each of the preceding specifiers The conditions can be presence (or absence) of certain HTTP status code(s) For example, let s say you want to log all referring URLs that pointed a user to a nonexistent page In such a case, the server produces a 404 status (Not Found) header So, to log the referring URLs you can use the format specifier:
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