How to dump entire HTTP requests with apache

Is it possible to dump entire HTTP requests by apache? I need to track all HTTP headers of incomming requests. How to do that?

I think what you want instead of Apache might be a packet analyzer, Also known as a packet sniffer. Two of the most popular ones are probably TCPDump and Wireshark, both of which are free and have versions for Windows and *nix operating systems. These will show you all traffic coming in on an interface, not just what Apache sees. But you can use filters to restrict to a specified port, such as 80 for http.

tcpdump:
The following command run from the server will show you all packets destined for port 80:

sudo tcpdump -s 0 -X 'tcp dst port 80'

The capital X switch dumps the payload in hex and ASCII. The s switch with 0 means to get the whole packet. 'tcp dst port 80' means to filter and only show packets destined for port 80 in the tcp header.

Wireshark:
For the more user friendly version, if you have a GUI running, consider wireshark (formally known as ethereal).

maybe dumping of cookies ? otherwise - look at mod_dumpio.