pRPC: Retry on certain transient HTTP failures.

pRPC: Retry on certain transient HTTP failures.

AppEngine can directly return certain retriable HTTP failures before
hitting the actual pRPC service. Modify the pRPC client to retry on
these failures by default.

BUG=chromium:649454
TEST=None
R=iannucci@chromium.org, nodir@chromium.org

Committed: https://github.com/luci/luci-go/commit/25b6d8dd95fb75b45fb7454c76cc0a4d7fa3e0fc

[dnj, 2016-09-22 20:57:46]

The CQ bit was checked by dnj@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-22 20:57:58]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-22 21:08:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-22 21:08:59]

Dry run: This issue passed the CQ dry run.

[nodir, 2016-09-26 16:31:08]

lgt

[nodir, 2016-09-26 16:31:39]

lgtm! looks good objectively

[dnj (Google), 2016-09-26 16:33:37]

The CQ bit was checked by dnj@google.com

[commit-bot: I haz the power, 2016-09-26 16:33:40]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-26 16:45:56]

Description was changed from

==========
pRPC: Retry on certain transient HTTP failures.

AppEngine can directly return certain retriable HTTP failures before
hitting the actual pRPC service. Modify the pRPC client to retry on
these failures by default.

BUG=chromium:649454
TEST=None
R=iannucci@chromium.org, nodir@chromium.org
==========

to

==========
pRPC: Retry on certain transient HTTP failures.

AppEngine can directly return certain retriable HTTP failures before
hitting the actual pRPC service. Modify the pRPC client to retry on
these failures by default.

BUG=chromium:649454
TEST=None
R=iannucci@chromium.org, nodir@chromium.org

Committed:
https://github.com/luci/luci-go/commit/25b6d8dd95fb75b45fb7454c76cc0a4d7fa3e0fc
==========

[commit-bot: I haz the power, 2016-09-26 16:45:57]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/25b6d8dd95fb75b45fb7454c76cc0a4d7fa3e0fc