Apache HTTP Filter/Logging

I am using IBM HTTP Server 6.1 / Apache 2.0.47. I would like to pull a specific piece of data out of all requests coming through the HTTP server and if it exists log the found data along with the target URL. It needs to be as efficient as possible.

Is a filter appropriate or a handler? Do开发者_如何转开发es a filter/handler exist that I can configure and use as is or do I need to write something? How do I configure, or write this?

Thanks.

You could use mod_security apache module , which have a good audit log tool SecAuditLog (log all headers), that you can declench by http status. You'll find as well fine filters, that will maybe fits your needs.

And do not hesitate to ask servfault gurus on that.