nginx "An error occurred."

An error occurred.

Sorry, the page you are looking for is currently unavailable.
Please try again later.

If you are the system administrator of this resource then you should check the error log for details.

Faithfully yours, nginx.

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/var/log/nginx/error.log

=======================

2016/08/18 15:07:58 [error] 20970#0: *408 upstream sent too big header while reading response header from upstream, client: 127.0.0.1, server: www.도메인, request: "POST /index.php/member/signin_write/signin_write_ok HTTP/1.1", upstream: "fastcgi://unix:/tmp/php5-fpm.sock:", host: "도메인주소", referrer: "http://도메인주소/member/signin_write"

========================

nginx.conf

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http{

    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;

}

========================

default.conf

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server {

location ~ {

    fastcgi_buffer_size 128k;
    fastcgi_buffers 4 256k;
    fastcgi_busy_buffers_size 256k;

}

}

=========================

service nginx restart

service php-fpm restart

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참고 url -

http://stackoverflow.com/questions/13894386/upstream-too-big-nginx-codeigniter

http://jpss.ta3ke.com/173