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dgaudet
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on 04 Jun 99
This patch removes the processing of `mxb' parameters in Accept
headers in mod_negotiation. A second patch updates the manual to
reflect th… Show more
This patch removes the processing of `mxb' parameters in Accept

headers in mod_negotiation.  A second patch updates the manual to

reflect this (mxb is not documented directly in the manual but support

for it is implied in one place).

Reasons for removing this feature:

1) As currently implemented, the 'mxb' feature makes possible certain

denial-of-service attacks on negotiated content.  These attacks are

posssible for user communities which access an Apache server from

behind a HTTP/1.1 proxy which implements `Vary' related optimisations.

Plugging this denial of service hole without removing `mxb' is fairly

expensive in terms of degrading caching efficiency.

2) `mxb' is not in HTTP/1.0 or HTTP/1.1 or any other standard

3) Nobody seems to make use of 'mxb'.  (Balachander Krishnamurthy

kindly offered to grep some of his web traffic traces -- he did not

find a single Accept with mxb in a whole day of recent traffic, nor in

older traces)

4) Removing a feature makes a nice change from adding features.

Submitted by:   Koen Holtman <Koen.Holtman@cern.ch>

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