To debug my webapp behaviour behind some weird network, I need to dump all HTTP request coming to the Apache2 server (on a standard Ubuntu). So I tryed to activate the dump_io module :

a2enmod dump_io

and I checked that the module was correctly loaded (after reload) by :

# apache2ctl -t -D DUMP_MODULES | grep dumpio
dumpio_module (shared)

I added the following in the <VirtualHost> part of my site :

LogLevel debug
DumpIOInput On

Then service apache2 restart and tail -f /var/log/apache2/error.log

but nothing is showing...

I tryed putting the directive at global level (apache2.conf), putting all virtual hosts LogLevel to debug (as suggested in Why can't I get Apache2 mod_dumpio working under Lucid Lynx Ubuntu?) but no luck...

The only thing I'm getting related to my setInfo request is the following line (in error.log) which does not show if I set loglevel to warn, but shows event if I don't declare the DumpIOInput.

[Tue Nov 06 00:21:13 2012] [debug] mod_deflate.c(615): [client] Zlib: Compressed 494 to 284 : URL /setInfo

So, what can I do next ? I'm pretty sure that I have incoming requests on my virtualhost, because I get the following error (which is the one I'm trying to clarify and debug) :

[Tue Nov 06 09:24:42 2012] [error] [client] no acceptable variant: /path/api/setInfo
  • ServerFault is officially empty... :/
    – Orabîg
    Aug 21 '14 at 10:39

1> To configure mod_dumpio you need to enable dump_io.

$ sudo a2enmod dump_io

2> in apache2.conf file write this line

LogLevel dumpio:trace7
DumpIOInput On
DumpIOOutput On

3) Then restart apache server

  • Hum, many thanks. However, I just don't know why in the hell I asked this question, and why it was useful for me at the time. Well, it was in 2012 you know. :p
    – Orabîg
    Jul 3 '16 at 14:25
  • It does dumping logs to error.log file. But I can't find the log of POST-ed data. How can I enable it? I searched/googled it, I only found the old posts that don't work on my machine. Nov 14 '16 at 4:24

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