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@Martin, weird, I'm still not seeing any files/dirs matching 'rc3'. 
I have refreshed properly (cache-control 0 + empty cache) and still getting a similar listing.
Fresh fetch output on the index URL:
<a href="Python-3.5.0rc1.tar.xz">Python-3.5.0rc1.tar.xz</a> 11-Aug-2015 01:00 14798596^M
<a href="Python-3.5.0rc1.tar.xz.asc">Python-3.5.0rc1.tar.xz.asc</a> 11-Aug-2015 01:00 819^M
<a href="Python-3.5.0rc1.tgz">Python-3.5.0rc1.tgz</a> 11-Aug-2015 00:59 20038557^M
<a href="Python-3.5.0rc1.tgz.asc">Python-3.5.0rc1.tgz.asc</a> 11-Aug-2015 01:00 819^M
<a href="Python-3.5.0rc2.tar.xz">Python-3.5.0rc2.tar.xz</a> 25-Aug-2015 17:26 14841476^M
<a href="Python-3.5.0rc2.tar.xz.asc">Python-3.5.0rc2.tar.xz.asc</a> 25-Aug-2015 17:26 819^M
<a href="Python-3.5.0rc2.tgz">Python-3.5.0rc2.tgz</a> 25-Aug-2015 17:25 20055455^M
<a href="Python-3.5.0rc2.tgz.asc">Python-3.5.0rc2.tgz.asc</a> 25-Aug-2015 17:26 819^M
<a href="python-3.5.0a1-amd64-webinstall.exe">python-3.5.0a1-amd64-webinstall.exe</a> 08-Feb-2015 03:14 916296^M
<a href="python-3.5.0a1-amd64.exe">python-3.5.0a1-amd64.exe</a> 08-Feb-2015 03:14 22844576^M
<a href="python-3.5.0a1-macosx10.5.pkg">python-3.5.0a1-macosx10.5.pkg</a> 08-Feb-2015 02:28 25160803^M
<a href="python-3.5.0a1-macosx10.5.pkg.asc">python-3.5.0a1-macosx10.5.pkg.asc</a> 8-Feb-2015 02:28 819^M
Resolved host is: 103.245.222.223
Perhaps too-aggressive cache configuration, or not so good revalidate settings @ Fastly?