Problem generating Transfer-Encoding: chunked

16 Sep 2006

      Hi All,

I'm in the process of writing a python script that goes through a long 
list in batches and outputs its progress to HTML. (Zope 2.7.5 behind Apache)

The result is not what I expected: instead of returning the results in 
small chunks, Zope (Apache, gremlins?) rewrites the output and returns 
much larger sections of data.

If I remove the Transfer-Encoding header and replace it with a fixed 
Content-Length, I can see that my script outputs its chunks as intended...

Can anyone offer suggestions?

Norbert

[Code below:]

RESPONSE=context.REQUEST.RESPONSE
RESPONSE.setHeader('Content-Type', 'text/html')
RESPONSE.setHeader('Transfer-Encoding', 'chunked')
RESPONSE.write( str(hex(len(htmlHeader)))[2:]+'\n'+htmlHeader+'\n' )

def doBatch(start, end):
   -- run through list and output --
   RESPONSE.write(str(hex(len(htmlContent)))[2:]+'\n'+htmlContent+'\n')

while myBatch <= numBatches and start <> -1:
   start = doBatch(start,end)
   end = start + batchSize
   myBatch +=1

RESPONSE.write(str(hex(len(htmlFooter)))[2:]+'\n'+htmlFooter+'\n\n')

[incorrect HTML output snippet:]

HTTP/1.1 200 OK
Date: Fri, 15 Sep 2006 22:37:22 GMT
Server: Zope/(Zope 2.7.5-final, python 2.3.5, freebsd4) ZServer/1.1
Content-Type: text/html
X-Cache: MISS from xxx.xxx.xxx
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Transfer-Encoding: chunked

db8
<html>
   <head>
     <title>Progress Report...</title>
   </head>
   <body>
     <h2>Batch 0: 0 - 25</h2>     <-- expected new chunk
     <p>[data]</p>
     <h2>Batch 1: 26 - 51</h2>    <-- expected new chunk
     <p>[data]</p>
     <h2>Batch 2: 51 - 76</h2>    <-- expected new chunk
     <p>[data]</p>
45e
     <h2>Batch 3: 76 - 101</h2>   <-- why does chunk start here?
     <p>[data]</p>
     <hr>                         <-- expected new chunk
     <h2>DONE!</h2>
   </body>
</html>
0

Norbert Marrale

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