For the libcurl bindings in the R programming language, I would like
to user to be able to connect to an arbitrary server using any
authentication method. However setting CURLOPT_HTTPAUTH to
CURLAUTH_ANY actually causes authentication failures in some cases.

Here is an example:
https://gist.github.com/jeroenooms/94ed3749f0f401900b73. This
particular example uses hidden basic auth. It works with the default
CURLOPT_HTTPAUTH but when we set it to CURLAUTH_ANY it fails.

When we change the URL to http://httpbin.org/basic-auth/jerry/secret
we see what happens. When CURLAUTH_ANY is set, curl first performs a
request without Authorization header, and then when the server returns
a 401 it tries again with Authorization header. This doesn't work for
hidden auth because it returns a 404 instead of 401.
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Received on 2015-06-05