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Add lowlevel_error_handler documentation back to README (#1866)

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Jose Luis Salas 2019-07-28 19:31:47 +02:00 • committed by Nate Berkopec
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@ -137,6 +137,20 @@ end
Preloading can’t be used with phased restart, since phased restart kills and restarts workers one-by-one, and preload_app copies the code of master into the workers.
### Error handling
If puma encounters an error outside of the context of your application, it will respond with a 500 and a simple
textual error message (see `lowlevel_error` in [this file](https://github.com/puma/puma/blob/master/lib/puma/server.rb)).
You can specify custom behavior for this scenario. For example, you can report the error to your third-party
error-tracking service (in this example, [rollbar](http://rollbar.com)):
```ruby
lowlevel_error_handler do |e|
Rollbar.critical(e)
[500, {}, ["An error has occurred, and engineers have been informed. Please reload the page. If you continue to have problems, contact support@example.com\n"]]
end
```
### Binding TCP / Sockets
Bind Puma to a socket with the `-b` (or `--bind`) flag: