On 1 Dec 2010, at 12:11, Sternath, Elmar (NSN - DE/Munich) wrote:

> Hi,
> 
> We use Apache 2.2.16 as a reverse proxy on both UNIX and Windows environment 
> (by use of mod_proxy). In both environments, we have trouble when uploading 
> big files (size 10 MB, upload time from client to proxy approx. 40 sec.) to 
> the proxied backend application in Internet. 

What proxy-sendcl/proxy-sendchunks setting are you using?

If you use proxy-sendcl, apache has to buffer all the data and you could be 
hitting a timeout.
If proxy-sendchunks, does your backend support chunked encoding?

-- 
Nick Kew
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