# PHP-FPM "upstream sent too big header."

**URL:** <https://www.ruby-forum.com/t/php-fpm-upstream-sent-too-big-header/226373>\
**Category:** NGINX\
**Created:** [July 24, 2012, 12:02pm UTC](https://www.ruby-forum.com/t/php-fpm-upstream-sent-too-big-header/226373 "2012-07-24T12:02:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![HTF](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/b19c9b/32.png) [@HTF](https://www.ruby-forum.com/u/HTF)\
**Post date:** [July 24, 2012, 12:02pm UTC](https://www.ruby-forum.com/t/php-fpm-upstream-sent-too-big-header/226373/1 "2012-07-24T12:02:03Z")

</div>

Hi,

I’ve noticed the following error message in the logs:

“2012/07/24 11:26:19 [error] 18623#0: \*521909 upstream sent too big  
header while reading response header from upstream, client…”

I’ve read the documentation and I do want to disable buffering to disk  
so I’ve set “fastcgi\_max\_temp\_file\_size 0;” in  
“/etc/nginx/fastcgi\_params” (this file is included in the config  
“include fastcgi\_params;”).

Could you please advise which parameters need to be configured to solve  
the issue from the error log?

If I set the following parameters:

fastcgi\_buffer\_size 128k;  
fastcgi\_buffers 256 4k;  
fastcgi\_busy\_buffers\_size 256k;  
fastcgi\_temp\_file\_write\_size 256k;

- is this going to overwrite the “fastcgi\_max\_temp\_file\_size”  
directive?

Regards

Posted at Nginx Forum:

> **[PHP-FPM "upstream sent too big header..."](https://forum.nginx.org/read.php?2,228926,228926#msg-228926)**
>
> Hi, I've noticed the following error message in the logs: "2012/07/24 11:26:19 \[error\] 18623#0: \*521909 upstream sent too big header while reading response header from upstream, client..." I've read the documentation and I do want to...