When the destination service returns a hint that an endpoint is another
proxy, eligible HTTP1 requests are translated into HTTP2 and sent over
an HTTP2 connection. The original protocol details are encoded in a
header, `l5d-orig-proto`. When a proxy receives an inbound HTTP2
request with this header, the request is translated back into its HTTP/1
representation before being passed to the internal service.
Signed-off-by: Sean McArthur <sean@buoyant.io>
The `Backoff` service wrapper is used for the controller client service
so that if the proxy can't find the controller (there is a connection
error), it doesn't keep trying in a tight loop, but instead waits a
couple seconds before trying again, presuming that the control plane
was rebooting.
When "backing off", a timer would be set, but it wasn't polled, so the
task was never registered to wake up after the delay. This turns out to
not have been a problem in practice, since the background destination
task was joined with other tasks that were constantly waking up,
allowing it to try again anyways.
To add tests for this, a new `ENV_CONTROL_BACKOFF_DELAY` config value
has been added, so that the tests don't have to wait the default 5
seconds.
Signed-off-by: Sean McArthur <sean@buoyant.io>
Sean McArthur
Oliver Gould