Via eadler@ on phabricator review: (a) some of you have experienced brokeness with arc recently. This is due to a bug in cURL: cURL 7.43 has a bug where "Content-Length" is incorrectly cached between requests on the same connection, which breaks the 2nd..Nth request when connections are reused. Recent versions of libphutil work around the issue (the port update is here: https://reviews.freebsd.org/D2894). In the meantime either downgrade cURL to a version earlier than 7.43.0, upgrade cURL to HEAD, or wait for 7.43.1 and upgrade cURL.
A commit references this bug: Author: grembo Date: Fri Jun 26 10:12:45 UTC 2015 New revision: 390625 URL: https://svnweb.freebsd.org/changeset/ports/390625 Log: Update devel/arcanist, devel/libphutil, devel/phabricator to 20150626. This should fix a couple of issues (including a problem caused by a bug curl 7.43). Note that differential revision points to an earlier patch (but it's related, so I think that's fine). PR: 201121 Differential Revision: https://reviews.freebsd.org/D2894 Approved by: mentors (implicit) Changes: head/devel/arcanist/Makefile head/devel/arcanist/distinfo head/devel/arcanist/pkg-plist head/devel/libphutil/Makefile head/devel/libphutil/distinfo head/devel/libphutil/pkg-plist head/devel/phabricator/Makefile head/devel/phabricator/distinfo head/devel/phabricator/pkg-plist