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From Brian Pane <>
Subject Re: Questions about filter placement
Date Fri, 30 Aug 2002 00:10:00 GMT wrote:

>Well, my main concern is if there are things down the line which buffer large
>portions of data before sending them out, it would generate "bursty" network
>traffic, which I want to avoid.  Part of the reason I'm doing this is because I
>want to have more smooth control of network utilization so it doesn't impact
>other services or requests..
>I had seen some notes about the content-length filter, for example, setting
>aside the entire response until it got the end of it, which if my filter was
>before it would completely defeat the behavior of my rate limiting..

In the specific case of the content-length filter, the problem is now
fixed; as of a change I committed yesterday, it no longer tries to buffer
the entire response.  In general, I think we should avoid letting any
filter buffer an unbounded amount of data like the C-L filter used to

>>if you are basing the rate limiting on something on the request I would 
>>suggest you write a request hook, (somewhere after the request headers 
>>have been read.. forget the name for the moment) and make it set a note
>>in the connection record. (or maybe use the apr_pool_userdata_set(pool) 
>>call it's faster)

Another possibility would be to create a new metadata bucket type.
In a request-level hook or filter, insert a metadata bucket that
describes the appropriate bandwidth-throttling rules for the buckets
that follow.  Then you can use a connection-level filter to do the
actual throttling; that filter, which won't otherwise have access
to request-level information, can look at the metadata buckets to
figure out what bandwidth limit to apply.


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