The status calls are sometimes failing on:
upstream connect error or disconnect/reset before headers. reset reason:
connection termination
Since all requests are going through the company proxy, I think that the
networking isn't working 100% reliably. This commit adds a retry mechanism
provided by the urllib3 library. It will retry on all networking issues and
also on some 5xx errors that makes sense to retry (like gateway failures).
A test is added that runs the compose waiting code against a mock server
that fails every second request. This is imho sufficient to mimick a flaky
networking.
d38e11ea8a