Custom 502 error page is ignored

Dear all,

I’m currently wondering why nginx ignores my custom 502 Bad Gateway page
and
instead serves the internal 502 error page.
I’m using nginx version 1.2.4 and php-fpm 5.4.8

The behaivior occures every time and is reproducible:
If I stop php-fpm and request an existing php file my custom 502 error
page
is shown, so everything is fine.
But if I request a non existing php file nginx shows me the nginx
internal
502 error page.

I don’t know why my custom 502 error page is ignored, because it’s a
static
html file.
Do you have any tipps for me?

Part from the debug log:
2012/11/25 15:29:09 [debug] 10777#0: *26 http script var: “/index2.php”
2012/11/25 15:29:09 [debug] 10777#0: *26 trying to use file:
“/index2.php”
“/usr/share/nginx/html/index2.php”
2012/11/25 15:29:09 [debug] 10777#0: *26 trying to use file: “=404”
“/usr/share/nginx/html=404”
2012/11/25 15:29:09 [debug] 10777#0: *26 http finalize request: 404,
“/index2.php?” a:1, c:1
2012/11/25 15:29:09 [debug] 10777#0: *26 http special response: 404,
“/index2.php?”
2012/11/25 15:29:09 [debug] 10777#0: *26 internal redirect: “/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 rewrite phase: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 test location: “/”
2012/11/25 15:29:09 [debug] 10777#0: *26 test location: “502.html”
2012/11/25 15:29:09 [debug] 10777#0: *26 test location: “404.html”
2012/11/25 15:29:09 [debug] 10777#0: *26 using configuration
“=/404.html”

http run request: “/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http upstream check client,
write
event:1, “/404.html”
2012/11/25 15:29:09 [debug] 10777#0: *26 http upstream recv(): -1 (11:
Resource temporarily unavailable)
2012/11/25 15:29:09 [debug] 10777#0: *26 http upstream request:
“/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http upstream process header
2012/11/25 15:29:09 [error] 10777#0: *26 connect() failed (111:
Connection
refused) while connecting to upstream, client: 10.0.2.2, server:
localhost,
request: “GET /index2.php HTTP/1.1”, upstream:
“fastcgi://127.0.0.1:9000”,
host: “127.0.0.1”
2012/11/25 15:29:09 [debug] 10777#0: *26 http next upstream, 2
2012/11/25 15:29:09 [debug] 10777#0: *26 free rr peer 1 4
2012/11/25 15:29:09 [debug] 10777#0: *26 finalize http upstream request:
502
2012/11/25 15:29:09 [debug] 10777#0: *26 finalize http fastcgi request
2012/11/25 15:29:09 [debug] 10777#0: *26 free rr peer 0 0
2012/11/25 15:29:09 [debug] 10777#0: *26 close http upstream connection:
8
2012/11/25 15:29:09 [debug] 10777#0: *26 free: 0000000001F7C560, unused:
48
2012/11/25 15:29:09 [debug] 10777#0: *26 event timer del: 8:
1353853809503
2012/11/25 15:29:09 [debug] 10777#0: *26 reusable connection: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 http finalize request: 502,
“/404.html?” a:1, c:1
2012/11/25 15:29:09 [debug] 10777#0: *26 http special response: 502,
“/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http set discard body
2012/11/25 15:29:09 [debug] 10777#0: *26 HTTP/1.1 502 Bad Gateway
Server: nginx/1.2.4
Date: Sun, 25 Nov 2012 14:29:09 GMT
Content-Type: text/html
Content-Length: 172
Connection: keep-alive

2012/11/25 15:29:09 [debug] 10777#0: *26 write new buf t:1 f:0
0000000001F385A8, pos 0000000001F385A8, size: 156 file: 0, size: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 http write filter: l:0 f:0
s:156
2012/11/25 15:29:09 [debug] 10777#0: *26 http output filter “/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http copy filter: “/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http postpone filter
“/404.html?”
0000000001F38778
2012/11/25 15:29:09 [debug] 10777#0: *26 write old buf t:1 f:0
0000000001F385A8, pos 0000000001F385A8, size: 156 file: 0, size: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 write new buf t:0 f:0
0000000000000000, pos 000000000069B3E0, size: 120 file: 0, size: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 write new buf t:0 f:0
0000000000000000, pos 000000000069A1A0, size: 52 file: 0, size: 0
2012/11/25 15:29:09 [debug] 10777#0: *26 http write filter: l:1 f:0
s:328
2012/11/25 15:29:09 [debug] 10777#0: *26 http write filter limit 0
2012/11/25 15:29:09 [debug] 10777#0: *26 writev: 328
2012/11/25 15:29:09 [debug] 10777#0: *26 http write filter
0000000000000000
2012/11/25 15:29:09 [debug] 10777#0: *26 http copy filter: 0
“/404.html?”
2012/11/25 15:29:09 [debug] 10777#0: *26 http finalize request: 0,
“/404.html?” a:1, c:1
2012/11/25 15:29:09 [debug] 10777#0: *26 set http keepalive handler
2012/11/25 15:29:09 [debug] 10777#0: *26 http close request
2012/11/25 15:29:09 [debug] 10777#0: *26 http log handler

Example configuration:

upstream php_fpm {
server 127.0.0.1:9000;
}

server {
listen 80;
server_name localhost;
root /usr/share/nginx/html;

error_log /var/log/nginx/default.log debug;

location / {
index index.php index.html index.htm;
}

error_page 404 /404.html;
error_page 502 /502.html;
location = /404.html {
fastcgi_intercept_errors on;
include /etc/nginx/fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/404.php;
fastcgi_index index.php;
fastcgi_pass php_fpm;
}
location = /502.html {
}
location ~* .php$ {
try_files $uri =404;
fastcgi_intercept_errors on;
include /etc/nginx/fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_index index.php;
fastcgi_pass php_fpm;
}
}

Best regards,
Gus

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,233209,233209#msg-233209

Hello!

On Sun, Nov 25, 2012 at 09:52:43AM -0500, gus0253 wrote:

502 error page.

I don’t know why my custom 502 error page is ignored, because it’s a static
html file.
Do you have any tipps for me?

[…]

The 502 error happens while processing 404 error, and by default
nginx won’t do another error_page redirection after first one. If
you really want nginx to handle multiple error_page redirections,
use the “recursive_error_pages” directive, see here:

http://nginx.org/r/recursive_error_pages

You should be careful to avoid loops though.


Maxim D.
http://nginx.com/support.html

On Sun, Nov 25, 2012 at 09:52:43AM -0500, gus0253 wrote:

502 error page.

I don’t know why my custom 502 error page is ignored, because it’s a static
html file.
Do you have any tipps for me?

Querying index2.php results in error 404 handled by location “/404.html”
which in turn results in (recursive) error 502 if php-fpm is stopped.

http://nginx.org/r/recursive_error_pages

(Turn it on in the location “~* .php$”.)

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