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From Stefan Fritsch>
Subject Configurable error log format
Date Wed, 18 Aug 2010 18:31:44 GMT

I finally got around to finish the remaining bits of the configurable
error log format thing. The current version is at

I intend to commit it to trunk after I have written some docs and 2.3.7
is tagged. It duplicates some code from mod_log_config. If there are
enough people interested in unifying the log formaters for access and
error logs, we can do that work in trunk. Personally, I don't think
it's necessary for 2.4.

I have changed the configuration syntax with some of the suggestions
form the last thread. The log format is implicitly split into fields
at non-whitespace to whitespace transitions. A backslash before a space
will prevent this behaviour. Percent-space '% ' can be used as
zero-width field separator.

If a format item does not produce output, the whole field is omitted.
This behaviour can be changed with modifiers: "-" to log a "-" instead.
"+" to omit the whole line instead (useful for once per request

For normal log lines, there is now only one format that contains %M
for the actual log message. The separate prefix and suffix configuration
is gone.

For example, the configuration

ErrorLogFormat connection "[%{uc}t] [C:%{c}L] local\ %a remote\ %A"
ErrorLogFormat request "[%{uc}t] [R:%L] Request %k on C:%{c}L pid:%P tid:%T"
ErrorLogFormat request "[%{uc}t] [R:%L] UA:'%+{User-Agent}i'"
ErrorLogFormat request "[%{uc}t] [R:%L] Referer:'%+{Referer}i'"
ErrorLogFormat "[%{uc}t] [%-m:%-l] [R:%L] [C:%{C}L] %M"


[2010-08-18 20:10:11.135760] [C:CFn8+QwXPQo] local remote
[2010-08-18 20:10:11.135783] [R:21j8+QwXPQo] Request 0 on C:CFn8+QwXPQo pid:11653
[2010-08-18 20:10:11.135788] [R:21j8+QwXPQo] UA:'curl/7.21.1 (i486-pc-linux-gnu) libcurl/7.21.1
OpenSSL/0.9.8o zlib/ libidn/1.18 libssh2/1.2.6'
[2010-08-18 20:10:11.153439] [core:error] [R:21j8+QwXPQo] File does not exist: /usr/local/apache2/htdocs/xxx


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