Nginx + PHP maximum output limit

nginxPHPphp-cliphp-fpm

I have php 5.5 (fpm) and nginx 1.10 installed (gzip configured to 1). Running on ubuntu.

When I am "echoing" a large output (over 2 mb), it stops abruptly at around 520 kb.

But same program when I run on php-cli, it has no problem "echoing" the whole thing onto the terminal.

Also downloading mysql dumps through adminer gets stopped in the half way. I mean incomplete files get downloaded (if the correct total output is bigger in couple of MBs).

How to fix this?

There is nothing wrong with my program. Even a simple long enough for loop spurting out echo "hello world" gets stopped at specific byte limit.

I am not sure if this issue is caused from nginx side or php side.

Best Answer

Try disabling buffering:

fastcgi_buffering off;

It's on by default.

This will give you a bit more control from within PHP, but be aware that flushing operations that didn't block previously may now block. It will also overcome any buffering issues Nginx may be encountering--I'd put my money on that being the issue. Nginx's buffers are efficient but fickle.

Correct way in new versions of nginx

Turn out my first answer to this question was correct at certain time, but it turned into another pitfall - to stay up to date please check Taxing rewrite pitfalls

I have been corrected by many SE users, so the credit goes to them, but more importantly, here is the correct code:

server {
       listen         80;
       server_name    my.domain.com;
       return         301 https://$server_name$request_uri;
}

server {
       listen         443 ssl;
       server_name    my.domain.com;
       # add Strict-Transport-Security to prevent man in the middle attacks
       add_header Strict-Transport-Security "max-age=31536000" always; 

       [....]
}

Nginx – How to restart php-fpm

Note: prepend sudo if not root

Using SysV Init scripts directly:

/etc/init.d/php-fpm restart    # typical
/etc/init.d/php5-fpm restart   # debian-style
/etc/init.d/php7.0-fpm restart # debian-style PHP 7

Using service wrapper script

service php-fpm restart    # typical
service php5-fpm restart   # debian-style
service php7.0-fpm restart # debian-style PHP 7

Using Upstart (e.g. ubuntu):

restart php7.0-fpm         # typical (ubuntu is debian-based) PHP 7
restart php5-fpm           # typical (ubuntu is debian-based)
restart php-fpm            # uncommon

Using systemd (newer servers):

systemctl restart php-fpm.service    # typical
systemctl restart php5-fpm.service   # uncommon
systemctl restart php7.0-fpm.service # uncommon PHP 7

Or whatever the equivalent is on your system.

Best Answer

Related Solutions

NGINX Redirect – How to Rewrite All HTTP Requests to HTTPS While Maintaining Sub-Domain

Correct way in new versions of nginx

Nginx – How to restart php-fpm

Related Topic