Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/119
@bostko Ah, thanks for explaining the use-case. Could we instead fix that
with an overloaded method:
public Builder credentials(Supplier<String> username,
Supplier<String> password) { ...
Under-the-covers, that could either instantiate a mutable
`UsernameAndPasswordCredentials`.
We'd need to be careful with a mutable credentials object. I'm not sure how
well `HttpClient` will cope with being instantiated with mutable credentials.
Hopefully it would be ok; I've never tried. (we create the `HttpClient` in
`HttpFeed.preStart()`, and then re-use it for each poll.
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