Is it possible to log the first line of the response in apache?

Question

Hey,

We have an Tomcat server where we're trying to log the HTTP version which the response is sent with. We've seen a few times that it seems to be HTTP/0.9, which kills the content (not supported I guess?). We would like to get some stats on this by using the access log in apache. However, since the header line for this isn't prefixed by anything, we cannot use the %{xxx}o logging.

Is there a way to get this?

An example:

Response is:

HTTP/1.1 503 This application is not currently available
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 1090
Date: Wed, 12 May 2010 12:53:16 GMT
Connection: close 

And we'd like the catch HTTP/1.1 (alternatively, HTTP/1.1 503 This application is not currently available.

Is this possible? We do not have access to the application being served, so we need to do this either as a Java filter, or in the tomcat access log - Preferably in the access log.

Answer 1

Enabling the <Valve className="org.apache.catalina.valves.RequestDumperValve"/> in server.xml writes out the request and response headers for each request.

Example:

19-May-2010 12:26:18 org.apache.catalina.valves.RequestDumperValve invoke
INFO:           protocol=HTTP/1.1