When a ConnectException is thrown (and possibly other exceptions), an unhandled fatal error can be hit:
Call to undefined function GuzzleHttp\Promise\rejection_for() in ...
This is due to deprecated methods having been replaced since guzzlehttp/promises 1.5.3, but the gmponos/guzzle_logger package has not been updated to use the replacements. In general, that package does not appear to be maintained any more. There is a fork which has been updated since, which looks to be the best alternative to me: https://packagist.org/packages/covergenius/guzzle_logger
Disconnect from the internet, and make a request from guzzle which will trigger the logging middleware.
Require a more up-to-date fork instead of gmponos/guzzle_logger. (An alternative solution could be to require guzzlehttp/promises <= 1.5.2 but that could introduce more problems for anyone needing to use a newer version of that!)
Provide change, test & review.
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1.1
Code
Resolve #3485367 "Replace unmaintained gmponos/guzzle_logger"