Directive proxy_next_upstream doesn't work?

[Maxim Dounin]

Hello!

On Thu, Dec 29, 2011 at 02:45:42AM -0500, defage wrote:

> nginx conf is:
> 
> http {
> large_client_header_buffers             8 8k;
> 
> proxy_buffers                           8 8K;
> proxy_buffer_size                       8K;
> 
> open_file_cache             max=1000 inactive=20s;
> open_file_cache_valid       30s;
> open_file_cache_min_uses    2;
> open_file_cache_errors      on;
> 
> 
> upstream backend {
>     server 10.10.2.100:8088 max_fails=200 fail_timeout=10;
>     server 10.10.2.101:8088 max_fails=200 fail_timeout=10;
>     server 10.10.2.102:8088 max_fails=200 fail_timeout=10;
>     server 10.10.2.103:8088 max_fails=200 fail_timeout=10;
> }
> 
> server {
> listen                                       80;
> server_name                            _;
> keepalive_timeout                    60;
> proxy_set_header                     Host $http_host;
> 
> proxy_connect_timeout             10;
> proxy_read_timeout                  10;
> proxy_next_upstream                error http_500 http_502 http_503
> http_504;
> add_header                               P3P "CP=CAO PSA OUR";
> add_header                               Cache-Control
> "must-revalidate,no-cache,private";
> 
> location / {
>     proxy_pass         http://backend;
> }
> }
> }
> 
> On my production, in the cases a server of upstream response http_504,
> but the request  doesn't to be transmitted to the next server, nginx
> response http 504 to client.

A request is passed to a next server only if not all (alive) 
upstream servers were tried yet.  Otherwise response from last 
tried server will be returned.

Maxim Dounin