[whatwg] Lifting cross-origin XMLHttpRequest restrictions?
brettz9 at yahoo.com
Thu Mar 11 23:35:48 PST 2010
My apologies if this has been covered before, or if my asking this is a
bit dense, but I don't understand why there are restrictions on
obtaining data via XMLHttpRequest from other domains, if the request
could be sandboxed to avoid passing along sensitive user data like
cookies (or if the user could be asked for permission, as when
installing browser extensions that offer similar privileges).
Servers are already free to obtain and mix in content from other sites,
If the concern is simply to give servers more control and avoid Denial
of Service effects, why not at least make the blocking opt in (like
robots.txt)? There are a great many uses for being able to mash up data
from other sites, including from the client, and it seems to me to be
unnecessarily restrictive to require explicit permissions. Despite my
suggesting opt-in blocking as an alternative, I wouldn't even think
there should be this option at all, since servers are technically free
to grab such content unhindered, and everyone I believe should have the
freedom and convenience to be able to design and enjoy applications
which "just work"--mixing from other pages without extra effort, unless
they are legally prohibited from doing so.
If the concern is copyright infringement, the same concern holds true
for servers which can already obtain such content unrestricted, and I do
not believe overly cautious preemptive policing is a valid pretext for
constraining technology and its opportunities for sites and users.
More information about the whatwg