bug: HttpProxyModule doesn't report errors using proxy_temp

[Maxim Dounin]

Hello!

On Sat, Oct 16, 2010 at 10:15:36AM +1100, jb wrote:

> If HttpProxyModule can't write to the directories inside proxy_temp
> (eg they are owned by root not server uid) then requests for URLs of
> large size fail after 102400 bytes, they hang in the client, then
> timeout and no errors are printed.

On error writing to proxy temp nginx logs "[crit] ... open() ...  
failed ..." message to error log and closes connection.

> In fact access_log shows code 200 for each request which was quite
> puzzling to debug.

Status code is one sent to client.  It's good idea to look into 
error log when you are trying to debug errors.

Actually, it's good idea to look into error log even if you are 
not trying to debug errors.

> maybe nginx -t should alert if one of the _temp directories has
> unwritable files or directories in it?

Temp directories may contain lots of subdirectories and 
scanning them all isn't considered wise.

Maxim Dounin