[Zope] unbuffered response.write through Apache 2.0 reverse proxy?

[Christoph Berendes]

Chris McDonough wrote:

> Apache does its own buffering IIRC.  Look for ProxyReceiveBufferSize/ 
> ProxyIOBufferSize.


Thanks. AFAICT 
(http://httpd.apache.org/docs/2.0/mod/mod_proxy.html#proxyiobuffersize), 
though, the buffer size settings have to be fairly large (512 or more, 
or 0 for the "system's default buffer size"). I'm actually writing very 
short progress messages, e.g.

Parsing page 1...
Parsing page 2...

etc.

so I've padded this with blanks to hit the buffer size. Klugey,but works.

>
>
> On Feb 18, 2006, at 3:59 AM, Christoph Berendes wrote:
>
>> To prevent browser timeout during a long running process, I've got  
>> the following code to work nicely,when the browser accesses Zope  
>> directly (e.g. http://myzope.net:8080/folder/client001/)
>>
>> context.REQUEST.response.write("progressing...")
>> #do some stuff
>> context.REQUEST.response.write("further...")
>> #do some more stuff
>> context.REQUEST.response.write("done!")
>>
>>
>> However, when browser goes through the Apache reverse proxy, e.g.
>>
>> <VirtualHost *:80>
>> ServerAlias   site1.foobar.com
>> ....
>>   RewriteRule ^/(.*) \
>>      http://localhost:8080/VirtualHostBase/http/%{SERVER_NAME}:80/% 
>> 1/site001/VirtualHostRoot/$1 [L,P]
>>
>> I get all three writes (progressing..further...done!) at once, at  
>> the end of the processing.
>>
>> I'm running Apache 2.0, Zope. 2.7.6, Plone 2.0.5 on Linux
>> From going through Apache docs and discussions (notably http:// 
>> www.gossamer-threads.com/lists/apache/dev/305433), it appears that  
>> this is an Apache 2.0 problem.
>>
>> Is there any way to get the same behavior (unbuffered writes) even  
>> when I go through the Apache reverse proxy?
>>
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