HTTP url for heads of files

[Alex Black]

I'd like to access the heads of files on a given branch via a url, e.g.
http://host/hg/
<branch>/files/project/src/main/java/com/acme/package/myfile.java

This way anyone or any application could access the latest version of a file
in a repository via HTTP.

I've looked a bit and it doesn't look like hg serve has this feature,
instead all urls have a changeset ID on them.  Is there a way to do this
with hg serve, or are there addons or 3rd party tools that might support
this?

- Alex
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