Proxy to apache timing out on php uploads?

hey folks,

for a fairly busy site that has the ability for users to upload 4
images at a time via php (which can be fairly large), i am proxying
dynamic requests from nginx to apache2 with:

location / {
access_log off;

proxy_redirect off;

proxy_set_header   Host             $host;
proxy_set_header   X-Real-IP        $remote_addr;
proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

client_max_body_size       10m;
client_body_buffer_size    128k;

proxy_connect_timeout      90;
proxy_send_timeout         90;
proxy_read_timeout         90;

proxy_buffer_size          4k;
proxy_buffers              4 32k;
proxy_busy_buffers_size    64k;
proxy_temp_file_write_size 64k;


and i’ve been getting timeout errors (i believe that’s what’s
happening) every so often … maybe 3-5 a day?

from mysql: Server error. 2006: MySQL server has gone away.

with these in PHP’s $_SERVER global (not sure if this is helpful…)

[REDIRECT_nokeepalive] => 1
[REDIRECT_ssl-unclean-shutdown] => 1
[REDIRECT_downgrade-1_0] => 1
[REDIRECT_force-response-1_0] => 1
[nokeepalive] => 1
[ssl-unclean-shutdown] => 1
[downgrade-1_0] => 1
[force-response-1_0] => 1

is this in fact a timeout error from the proxy? i’d never seen these
errors until i set up the nginx to serve static files and relay php
requests to apache. (which, btw, was super easy and made me an instant
nginx believer!)

if it is indeed a timing out issue, which setting would i bump up to
accommodate large php uploads?

thanks in advance,

ps: is there a daily digest option for this mailing list? it’s quite

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