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From Jack Bates <>
Subject Re: Download mirrors and cache hits
Date Sat, 24 Mar 2012 07:06:35 GMT
On 22/03/12 10:08 PM, James Peach wrote:
> On 22/03/2012, at 4:19 AM, Jack Bates wrote:
>> On 10/03/12 08:43 PM, Jack Bates wrote:
>>> What can sites like this do to help intermediate proxies like Apache
>>> Traffic Server make cache hits from requests for the same content from
>>> different mirrors?
>>> Are there any best practices?
>> Has there ever been any discussion or work on supporting RFC 6249 [1] or "Metalink"
[2] in Apache Traffic Server?
> No I don't think so.
>> I found this [3] mention of Metalink and intermediate caching proxies ("Metalink
integration with Proxy/Cache" heading)
> That sounds like a pretty useful project. There's probably a number of different ways
a plugin could implement this. Folks on the dev list or #traffic-server would be happy to
>> [1]
>> [2]
>> [3]

Thank you very much James, I am replying to the dev list

Perhaps a minimum viable product could:

   1. If the response status code is 3XX
   2. Scan RFC 6249 "Link: <...>; rel=duplicate" headers for URL that 
already exist in cache
   3. If found, update "Location: ..." header with this URL and pass on 

It could also check for an RFC 3230 "Digest: ..." header and, if found, 
check for content with same digest already in cache?

Could this behavior be achieved with any of the existing "remap" plugins?

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