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=encoding utf-8
=head1 NAME
ngx_http_session_log_module - Module ngx_http_session_log_module
=head1
The C<ngx_http_session_log_module> module enables logging
sessions (that is, aggregates of multiple HTTP requests) instead of
individual HTTP requests.
B<NOTE>
This module is available as part of our
commercial subscription.
=head1 Example Configuration
The following configuration sets up a session log and maps requests to
sessions according to the request client address and C<User-Agent>
request header field:
session_log_zone /path/to/log format=combined
zone=one:1m timeout=30s
md5=$binary_remote_addr$http_user_agent;
location /media/ {
session_log one;
}
=head1 Directives
=head2 session_log
B<syntax:> session_log I<I<C<name>> E<verbar> C<off>>
B<default:> I<off>
B<context:> I<http>
B<context:> I<server>
B<context:> I<location>
Enables the use of the specified session log.
The special value C<off> cancels the effect
of the C<session_log> directives
inherited from the previous configuration level.
=head2 session_log_format
B<syntax:> session_log_format I<
I<C<name>>
I<C<string>> ...>
B<default:> I<combined "...">
B<context:> I<http>
Specifies the output format of a log.
The value of the C<$body_bytes_sent> variable is aggregated across
all requests in a session.
The values of all other variables available for logging correspond to the
first request in a session.
=head2 session_log_zone
B<syntax:> session_log_zone I<
I<C<path>>
C<zone>=I<C<name>>:I<C<size>>
[C<format>=I<C<format>>]
[C<timeout>=I<C<time>>]
[C<id>=I<C<id>>]
[C<md5>=I<C<md5>>]
>
B<context:> I<http>
Sets the path to a log file and configures the shared memory zone that is used
to store currently active sessions.
A session is considered active for as long as the time elapsed since
the last request in the session does not exceed the specified
C<timeout> (by default, 30 seconds).
Once a session is no longer active, it is written to the log.
The C<id> parameter identifies the
session to which a request is mapped.
The C<id> parameter is set to the hexadecimal representation
of an MD5 hash (for example, obtained from a cookie using variables).
If this parameter is not specified or does not represent the valid
MD5 hash, nginx computes the MD5 hash from the value of
the C<md5> parameter and creates a new session using this hash.
Both the C<id> and C<md5> parameters
can contain variables.
The C<format> parameter sets the custom session log
format configured by the L</session_log_format> directive.
If C<format> is not specified, the predefined
“C<combined>” format is used.
=head1 Embedded Variables
The C<ngx_http_session_log_module> module supports
two embedded variables:
=over
=item C<$session_log_id>
current session ID;
=item C<$session_log_binary_id>
current session ID in binary form (16 bytes).
=back
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