HoneyryderChuck eb0291ed87 :circuit_breaker plugin: added support for .on_circuit_open callback
called when a circuit is open.

```ruby
HTTPX.plugin(:circuit_breaker).on_circuit_open do |req|
  # ... do smth
end
2023-06-12 20:42:57 +01:00
..
2020-10-30 16:19:18 +00:00
2023-04-17 18:09:24 +03:00