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Re: ACTION-902 (Reprise) Summarise and prepare proposed resolutions on HTTPS link rewriting.

From: Francois Daoust <fd@w3.org>
Date: Thu, 19 Mar 2009 18:06:41 +0100
Message-ID: <49C27BA1.3070904@w3.org>
To: "Sullivan, Bryan" <BS3131@att.com>
CC: Robert Finean <Rob.Finean@openwave.com>, Public MWBP <public-bpwg@w3.org>
Just chiming in, I do not know whether that's reasonable to do it or 
not, but I think it's possible to define a DNS record of the form 
*.example.org to target a server, removing the impossible need to have 
one DNS record per existing domain name around.


Sullivan, Bryan wrote:
> Hi Rob,
> The concern is based upon the a domain-based approach involving the assignment of subdomains through DNS. If the set of domains to be rewritten is fairly static (e.g. only a few changes per day) then DNS can handle it, although it is an overhead on someone (or some system) to update DNS records and for the records to be distributed through the DNS system as requested.
> An alternate approach is to use URL path tokens associated with the specific domains being rewritten, e.g. for "http://origdomain.com/path" one of the methods:
> "http://ctproxy.com/rewriter/origdomain.com/path"
> "http://ctproxy.com/rewriter/f8w7yf87ch/path" (where "f8w7yf87ch" is some token that the CT proxy assigns to the original domain)
> "http://ctproxy.com/rewriter?origuri=http://origdomain.com/path" (with URI escaping as needed)
> I'm sure there are many more such approaches.
> These approaches do not impact DNS, and thus are better suited for cases in which the CT proxy is not pre-configured to support rewriting for an arbitrary web site ala this sequence:
> (1) User browses to a site through the CT proxy
> (2) The site returns content with links to other sites, which are rewritten by the CT proxy to ensure the requests flow through it
> The sites in (2) may not already be setup for link rewriting at the CT proxy. It would be a very significant overhead on the DNS system to issue DNS update requests for such dynamically configured sites.
> Is that clearer?
> Best regards,
> Bryan Sullivan | AT&T
> -----Original Message-----
> From: Robert Finean [mailto:Rob.Finean@openwave.com] 
> Sent: Thursday, March 19, 2009 7:26 AM
> To: Sullivan, Bryan
> Cc: Public MWBP
> Subject: RE: ACTION-902 (Reprise) Summarise and prepare proposed resolutions on HTTPS link rewriting.
> Hi Bryan,
> I don't understand this rationale:
> <<
> 2) PROPOSED RESOLUTION: Proxies MAY rewrite links, where content
> transformation is permitted, providing that content domain origin
> distinctions are preserved by the proxy.
> -1 : Rationale is that scalability and basic ability to dynamically
> extend the link rewriting support to new sites will prevent a subdomain
> approach from being feasible. Link rewriters that I have worked with use
> URL path tokens associated with the original URI, which is scalable
> since there is no dependency upon DNS.
> Can you explain please (maybe an example)?
> thanks,
> ROb
Received on Thursday, 19 March 2009 17:07:21 UTC

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