Spring Framework 5.2.2 introduced a regression in
DefaultResponseErrorHandler.handleError(ClientHttpResponse)
Specifically, for use cases where the InputStream had already been
consumed by the first invocation of getResponseBody(), the second
invocation of getResponseBody() resulted in the response body being
absent in the created UnknownHttpStatusCodeException.
This commit fixes this by invoking getResponseBody() only once in
DefaultResponseErrorHandler.handleError(ClientHttpReponse) in order to
reuse the retrieved response body for creating the exception message
and as a separate argument to the UnknownHttpStatusCodeException
constructor.
Closes gh-24595
2fb13d410d