Hello,
try this
http://stackoverflow.com/questions/13894386/upstream-too-big-nginx-codeigniter

Regards,
Basti

On 10.02.2014 11:55, rubenarslan wrote:
> Hi Maxim & Jeroen,
>
> I'm the user Jeroen mentioned. I'm sorry for only being to produce sporadic
> errors earlier, I now made a test case which reliably produces
> the error, both on our server and Jeroen's server (so it's hopefully not
> just my amateur status with nginx).
>
> Of course, the ridiculously large proxy settings were only chosen in
> desperation, but I can now report that no increase of proxy buffer
> settings solves the problem at all (or shifts the treshold at which the
> error messages occur). So I think it's safe to say the error message
> upstream sent too big header while reading response header from upstream
> is misleading (unless the CORS headers that Jeroen added are somehow
> inflated through the POST request, wouldn't know why that would be).
>
>
> I can also now rule out that's its due to the headers sent or received.
>
> I receive only the following headers when the 502s occur
>
> HTTP/1.1 100 Continue
>
> HTTP/1.1 502 Bad Gateway
> Server: nginx/1.4.4
> Date: Mon, 10 Feb 2014 10:46:57 GMT
> Content-Type: text/html
> Content-Length: 172
> Connection: keep-alive
>
> And I sent only these
>
> POST /ocpu/library/base/R/identity HTTP/1.1
> Host: ourhost.xx
> Accept: */*
> Content-Length: 3545
> Content-Type: application/x-www-form-urlencoded
> Expect: 100-continue
>
>
> I do send a large request, 2241 characters (inlined JSON-ified data), but
> that is not near the upper limit of POST request as I know them.
>
> Here's the issue on the openCPU github, where I uploaded my test cases
> (sorry for it being a bit primitively done, I'm in a bit of a tight spot
> time-wise here and just an amateur):
> https://github.com/jeroenooms/opencpu/issues/76
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,247230,247327#msg-247327
>
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