Losing POST data on vanilla Ubuntu/nginx/mongrel install

Aaron Starr astarr at wiredquote.com
Sun Apr 5 02:55:31 MSD 2009

Maxim Dounin,

Thanks for your response!

I have several G on the logs volume, so for that reason it's probably
not a disk space issue.

Also, though, the log file thing seems to have been a red herring. I
just went and tried the POST, again, having made no changes at all
since last time, and it's not working, again. And the log files are

So, it seems that nginx randomly starts stripping POST data when
proxying to mongrel. I can't be the first person who's seen something
like this! I really don't think I've done anything unusual.

Can anyone think of a reason why POST data might be stripped when proxying?

Thanks for any ideas!


On Sat, Apr 4, 2009 at 7:38 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> Hello!
> On Sat, Apr 04, 2009 at 12:49:13AM -0700, Aaron Starr wrote:
>> Update on the missing POST data when proxying to mongrel:
>> This seems crazy, but it seems to me that the problem is related to
>> having very large, un-rotated nginx log files. I noticed that the
>> files were getting too large, and removed them (and got logrotate set
>> up), and now I get my POST data, again.
>> If anyone could confirm or deny this apparently nonsensical
>> explanation, that would be appreciated.
> Probably you have no space left for files in client_body_temp_path
> - and as soon as you removed large old logs there are space and
> everything is working again.
> Guess you have nothing in error_log due to the very same reason -
> no space left on device.
> Maxim Dounin
>> Aaron
>> On Fri, Apr 3, 2009 at 2:22 PM, Aaron Starr <astarr at wiredquote.com> wrote:
>> > Hi, all. Sorry in advance for what is hopefully a simple question.
>> >
>> > I'm using nginx as a reverse-proxy for a few mongrel instances. Using
>> > AJAX (XMLHttpRequest), I POST a small bit of JSON to the server. The
>> > request is properly proxied to mongrel, but with the POST data
>> > missing!
>> >
>> > [..]

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