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If the server responds 401 and the response body is empty, the client raises ResponseNotReady. This occurs because: 1. For a non-200 response, the response read only if the Content-Length header occurs. 2. The response must be read before another request (e.g. the follow-up request with WWW-Authenticate header set), and this condition was not met. For details see https://github.com/python/cpython/blob/v3.6.7/Lib/http/client.py#L1305-L1321. This situation should not arise in regular use, because the client either has a session cookie, or, knowing the details of the server it is contacting, it establishes the GSS-API context and includes the WWW-Authenticate header in the initial request. Nevertheless, this problem has been observed in the wild. I do not know its ordinary cause(s), but one can force the issue by removing an authenticated user's session cache from /run/ipa/ccaches, then performing a request. Resolve the issue by always reading the response. It is safe to call response.read() regardless of whether the Content-Length header appears, or whether the body is empty. Fixes: https://pagure.io/freeipa/issue/7752 Reviewed-By: Christian Heimes <cheimes@redhat.com>