These tests are not good unit tests and sometimes cause failures. I just experienced one today in CI.
These tests are not very useful. They pass e.g. http headers to HttpClient api, but never test for it. The only thing they test is that the generic digitalstrom webserver replies with 200. If we want useful tests, we need to start our own webserver in the test and verify against it.
In general, unit tests shall not make requests to remote addresses.