view .hgtags @ 41607:698667eb7523

lfs: disable all authentication except Basic for HTTP(S) connections

I ran into a problem pushing to an old Apache server- the normal outgoing
traffic occurred, the Batch API request and response occurred, and then things
suddenly halted.  5 minutes later, a 500 was returned, and the server log had a
timeout reading 32K from `self._req.bodyfh` in hgweb.request.sendresponse().
Watching in WireShark, the Batch API got a 401, retried properly, then proceeded
to PUT the blob (without authentication headers).  This got a 401, but the
client never retried with authentication.  Worse, the blob was sent over the
wire in the failed attempt.

This kills digests for both the Batch API and the Transfer API.  While in theory
we could have the Batch API provide external URLs to a place that supports Basic
Authentication, the LFS spec actually calls out using Basic Authentication[1].
It's not clear to me if they've been able to shoehorn in other methods.  But
let's keep it simple until somebody needs it.

If we only had to support python2, we could just not add the handler for digest
authentication.  However in python3, AbstractBasicAuthHandler raises ValueError
if it sees a scheme other than Basic.  So we need to intercept all other schemes
before it gets to that point.

# no-check-commit because of urllib2.OpenerDirector foo_bar calling conventions

[1] https://github.com/git-lfs/git-lfs/blob/master/docs/api/authentication.md

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