Filtering out non-HTTP requests (400 errors)

[merlin corey]

On Mon, Jan 11, 2010 at 9:22 AM, Michael Shadle <mike503 at gmail.com> wrote:
> On Mon, Jan 11, 2010 at 8:28 AM, Grzegorz Nosek
> <grzegorz.nosek at gmail.com> wrote:
>
>> So, is there a simple way to filter out non-HTTP requests from the
>> access log? http://wiki.nginx.org/HWLoadbalancerCheckErrors doesn't seem
>> to work unfortunately (I tried something along this way already and
>> checked this exact config now).
>
> I have this as well, but from some hardware load balancer our provider uses.
>
> I want to have it basically say:
>
> if ($remote_addr ~* 10.2.34.3) {
>  access_log off;
> }
>
> Or something of the nature. Note: that is pseudocode, I probably
> messed up the ~* but I just woke up. It was an example :)
>
> I think I tried this and it didn't work (and I'm sure Grzegorz tried it too)
>
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Not many things go well inside if aside from things defined in the
same module.  The only way without hacking code that I can think to do
this is with some internal servers that you proxy to conditionally
based on IP address.  It's dirty as hell, though XD -- example below
(untested so consider psuedoconfig):

upstream good {
  server 127.0.0.1:1234;
}

upstream bad {
  server 127.0.0.1:1235;
}

server {
  listen 80;
  server_name main_server;
  server_name_in_redirect off;
  access_log off;
  set $backend good;
  if ($remote_addr ~* 10.2.34.3) {
    set $backend bad;
  }
  location / {
    proxy_pass http://$backend;
  }
}

server {
  listen 127.0.0.1:1234;
  server_name good;
  .. good config ..
}

server {
  listen 127.0.0.1:1235;
  server_name bad;
  .. bad config ..
}

-- Merlin