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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2015-06-02T17:24:10Z"
+ content="""
+The S3 remote already does it when using the IA as a special case --
+it knows how to map from IA S3 buckets to archive.org urls, and so the
+special remote adds the url automatically. It would be quite easy to
+add that for non-IA; the user would just need to configure the url where
+the files in the bucket can be found.
+
+As noted, this does increase storage needs, since that's written to the
+git-annex branch. Although I'd expect it will compress pretty well when git
+gets around to packing it, since the added data is static base of the
+url, plus the key. Plus a little bit of overhead for hash directories and
+timestamps. Oh, and plus modifying the location tracking info to indicate
+that the file is present in the web special remote. Ok, maybe it's a lot of
+overhead. :)
+
+Could avoid writing this info to the git-annex branch, and just use a
+function to generate urls for keys that are known to be in S3. The
+`whereisKey` interface already exists -- it's how the web special remote
+adds urls to `whereis` display itself.
+
+But I'm not sure what to do about the complication that the S3
+special remote may not be enabled -- and if not, it doesn't get the
+opportunity to register such a function.
+
+Maybe this would need the S3 special remote to be enabled in read-only
+mode? Although, if we're going to do that, it could just handle the
+read-only retrieval itself, and not involve the web special remote at all.
+
+So:
+
+	git annex initremote S3 type=s3 ... bucket=foo readonlyurl=http://foo.s3.amazon.com/
+	# elsewhere
+	git annex enableremote S3 readonly=true
+"""]]