[mod_python] Implementing Range Retrieval Requests

Dear list,
I'm trying to implement a wide support for the HTTP 1.1 protocol in mod_python 
for streaming files to clients supporting caching, checksumming, range 
request.
In particular I'm now trying to implement support for "Range Retrieval 
Requests" 
<http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.2>.

Some range request come in the form of multiple ranges. The corresponding 
respose should be implemented, according to the rfc, by means of a 
multipart/byteranges output:
<http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16>

My implementation is currently sending to the user the common HTTP headers and 
then manually writing each "part" with each corresponding HTTP headers and 
boundaries.
Obviously in the main HTTP header I can't specify the actual content-length, 
because this will depend on the sum of the parts I'm going to send (and if my 
interpretation is correct this should account also for each sub-headers and 
boundaries).

In mod_python, not setting the content-length prior to sending the first byte 
to the client implies using (apparently) chunked-encoding. 

Since I'm already sending output to the client in a low-level way (by building 
each part of the multipart) is there a way to avoid chunked-encoding headers 
to be sent to the client?

Should I precalculate the content-length in order to disable chunked-encoding?

Best regards,
	Samuele
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